Monday, June 07, 2010
Static electricity Home Work
Static electricity is the imbalance of positive and negative charges. An atom contains protons, neutrons and electrons. Protons are positively charged, electrons are negatively charged and neutrons are neutral. Usually, atoms have the same number of electrons and protons. Then the atom has no charge, it is "neutral."If you rub things together, electrons can move from one atom to another this is how atoms get extra electrons. They have a negative charge. Atoms that lose electrons have a positive charge. When charges are separated like this, it is called static electricity.
There are appliances which uses the Principle of static electricity. They are:
Dust removal: There are some appliances that can eliminate dust from the air, like air purifiers. They use static electricity to alter the charges in the dust particles so that they stick to a plate or filter of the purifier that has an opposite charge as that of the dust (opposite charges attract each other).This effect is also used in industrial smokestacks to reduce the pollution that they generate, although they work in a very large scale, the effect is basically the same as the home air purifier.
Photocopy: Copy machines use static to make ink get attracted to the areas where we need the information copied. It uses the charges to apply the ink only in the areas where the paper to be copied is darker (usually this means text or other information) and not where the paper is white, this process is called xerography.
Car painting: To make sure a car's paint is uniform and that it will resist the high speeds and weather to protect the car's metal interior, it is applied with a static charge. The metal body of the car is submerged in a substance that charges it positively, and the paint is charged negatively with the paint sprayer.This process ensures a uniform layer of paint, since when there is enough negative paint in the car the extra will be repelled by the paint already in the car.It also ensures that the paint won't fall off, since the electrical attraction between the paint and the car is stronger than if it was just sprayed.
Static electricity is used in many real life situations. In general we use it for spray painting, car painting, photocopies, dust remover, filters and other pollution control devices. These are the main industries were static electricity is used besides giving an electrical shock. Hopefully from reading this you have learned about static electricity and the main uses of it in everyday life.
There are appliances which uses the Principle of static electricity. They are:
Dust removal: There are some appliances that can eliminate dust from the air, like air purifiers. They use static electricity to alter the charges in the dust particles so that they stick to a plate or filter of the purifier that has an opposite charge as that of the dust (opposite charges attract each other).This effect is also used in industrial smokestacks to reduce the pollution that they generate, although they work in a very large scale, the effect is basically the same as the home air purifier.
Photocopy: Copy machines use static to make ink get attracted to the areas where we need the information copied. It uses the charges to apply the ink only in the areas where the paper to be copied is darker (usually this means text or other information) and not where the paper is white, this process is called xerography.
Car painting: To make sure a car's paint is uniform and that it will resist the high speeds and weather to protect the car's metal interior, it is applied with a static charge. The metal body of the car is submerged in a substance that charges it positively, and the paint is charged negatively with the paint sprayer.This process ensures a uniform layer of paint, since when there is enough negative paint in the car the extra will be repelled by the paint already in the car.It also ensures that the paint won't fall off, since the electrical attraction between the paint and the car is stronger than if it was just sprayed.
Static electricity is used in many real life situations. In general we use it for spray painting, car painting, photocopies, dust remover, filters and other pollution control devices. These are the main industries were static electricity is used besides giving an electrical shock. Hopefully from reading this you have learned about static electricity and the main uses of it in everyday life.
Saturday, May 01, 2010
How Muscles Work and Their Relationship to Cellular Respiration:
Explain how your muscles work and their relationship to cellular respiration.
Body Building and Muscles
1. Do Muscles pull or push?
Muscles pull.
2. What happens when one muscle of the pair contracts (shortens)?
When one muscle of the pair contracts the other one relaxes.
3. In what ways is the model accurate?
It shows how muscles are located in your body and it also shows how muscles contract and relax.
4. In what ways is the model inaccurate?
It is inaccurate because in real life muscles contract and relaxes but the rubberband only gets shorter.
Muscles pull.
2. What happens when one muscle of the pair contracts (shortens)?
When one muscle of the pair contracts the other one relaxes.
3. In what ways is the model accurate?
It shows how muscles are located in your body and it also shows how muscles contract and relax.
4. In what ways is the model inaccurate?
It is inaccurate because in real life muscles contract and relaxes but the rubberband only gets shorter.
Friday, April 23, 2010
Circulatory System Quiz Questions :
1. What is responsible for pumping blood through your body?
- The Blood is responsible for pumping blood through your body.
2. The heart is a type of:
- The heart is a type of muscle.
3. What makes up your body's circulatory system?
- The heart, blood vessels, and blood make up your circulatory system.
4. What does blood bring to cells?
- Blood brings oxygen and nutrients to cells.
5. Where does blood become oxygenated?
- Blood becomes oxygenated in the lungs.
6. What are the three types of blood circulation in your body?
- The three types of blood circulation in your body are coronary, pulmonary, and systemic.
7. What is coronary circulation?
- Coronary circulation is the circulation with blood within your heart.
8. Systemic circulation requires help from :
- Systemic circulation requires help from arteries and veins.
9. What is the superior vena cava?
- The superior vena cava is a blood vessel.
10. What are arteries?
- Arteries are blood vessels that move blood away from the heart.
- The Blood is responsible for pumping blood through your body.
2. The heart is a type of:
- The heart is a type of muscle.
3. What makes up your body's circulatory system?
- The heart, blood vessels, and blood make up your circulatory system.
4. What does blood bring to cells?
- Blood brings oxygen and nutrients to cells.
5. Where does blood become oxygenated?
- Blood becomes oxygenated in the lungs.
6. What are the three types of blood circulation in your body?
- The three types of blood circulation in your body are coronary, pulmonary, and systemic.
7. What is coronary circulation?
- Coronary circulation is the circulation with blood within your heart.
8. Systemic circulation requires help from :
- Systemic circulation requires help from arteries and veins.
9. What is the superior vena cava?
- The superior vena cava is a blood vessel.
10. What are arteries?
- Arteries are blood vessels that move blood away from the heart.
How lungs work:
How your lungs Work:
When you breathe in your diaphragm contracts and your ribcage expands. To enter your lungs air needs to go through the trachea. A Human has only two lungs. Bronchial tubes are passage ways inside your lungs. The diaphragm is the muscle that allows you to breathe in and out. Oxygen cannot be stored in your body. When a human breathes out their body gets rid of carbon dioxide. Capillaries are tiny blood vessels. Alevoli are small sacs in your lung which store air. Emphysema can be caused by smoking.
Read More...
Your lungs are located within your chest cavity inside the rib cage. They are made of spongy, elastic tissue that stretches and constricts as you breathe. The airways that bring air into the lungs (the trachea and bronchi) are made of smooth muscle and cartilage, allowing the airways to constrict and expand. The lungs and airways bring in fresh, oxygen-enriched air and get rid of waste carbon dioxide made by your cells. They also help in regulating the concentration of hydrogen ion (pH) in your blood.
When you inhale, the diaphragm and intercostal muscles (those are the muscles between your ribs) contract and expand the chest cavity. This expansion lowers the pressure in the chest cavity below the outside air pressure. Air then flows in through the airways (from high pressure to low pressure) and inflates the lungs. When you exhale, the diaphragm and intercostal muscles relax and the chest cavity gets smaller. The decrease in volume of the cavity increases the pressure in the chest cavity above the outside air pressure. Air from the lungs (high pressure) then flows out of the airways to the outside air (low pressure). The cycle then repeats with each breath.
When you breathe in your diaphragm contracts and your ribcage expands. To enter your lungs air needs to go through the trachea. A Human has only two lungs. Bronchial tubes are passage ways inside your lungs. The diaphragm is the muscle that allows you to breathe in and out. Oxygen cannot be stored in your body. When a human breathes out their body gets rid of carbon dioxide. Capillaries are tiny blood vessels. Alevoli are small sacs in your lung which store air. Emphysema can be caused by smoking.
Read More...
Your lungs are located within your chest cavity inside the rib cage. They are made of spongy, elastic tissue that stretches and constricts as you breathe. The airways that bring air into the lungs (the trachea and bronchi) are made of smooth muscle and cartilage, allowing the airways to constrict and expand. The lungs and airways bring in fresh, oxygen-enriched air and get rid of waste carbon dioxide made by your cells. They also help in regulating the concentration of hydrogen ion (pH) in your blood.
When you inhale, the diaphragm and intercostal muscles (those are the muscles between your ribs) contract and expand the chest cavity. This expansion lowers the pressure in the chest cavity below the outside air pressure. Air then flows in through the airways (from high pressure to low pressure) and inflates the lungs. When you exhale, the diaphragm and intercostal muscles relax and the chest cavity gets smaller. The decrease in volume of the cavity increases the pressure in the chest cavity above the outside air pressure. Air from the lungs (high pressure) then flows out of the airways to the outside air (low pressure). The cycle then repeats with each breath.
Monday, April 19, 2010
Respiratory System Worksheet
2. Pharynx - Larynx - Trachea - Bronchi - Bronchioles - Alveoli.
3. Esophagus.
4. The hairs in your nasal cavity that push the dirt into the nose. These hairs are called "Cilia".
5.
a) Bronchioles (c)
b) Palate (d)
c) Trachea (b)
d) Alveoli (a)
e) Epiglottis (i)
f) Pharynx (g)
g) Expiration (h)
h) Diahragm (f)
i) Pleura (e)
j) Tidal Volume (j)
6.
B. The muscles between the ribs contract to move the ribs cranially and laterally.
D. The diaphragm contracts and flattens.
E. The lungs expand to fill up the space created.
A. The air pressure in the air tight pleural cavities decreases.
C. Air is drawn down the trachea into the lungs.
7.
a) True
b) False
c) True
d) True
e) True
f) False
g) True
3. Esophagus.
4. The hairs in your nasal cavity that push the dirt into the nose. These hairs are called "Cilia".
5.
a) Bronchioles (c)
b) Palate (d)
c) Trachea (b)
d) Alveoli (a)
e) Epiglottis (i)
f) Pharynx (g)
g) Expiration (h)
h) Diahragm (f)
i) Pleura (e)
j) Tidal Volume (j)
6.
B. The muscles between the ribs contract to move the ribs cranially and laterally.
D. The diaphragm contracts and flattens.
E. The lungs expand to fill up the space created.
A. The air pressure in the air tight pleural cavities decreases.
C. Air is drawn down the trachea into the lungs.
7.
a) True
b) False
c) True
d) True
e) True
f) False
g) True
Brainpop Smoking and Asthma Videos:
Asthma :
Asthma is a pretty common condition of the lungs. People with asthma have trouble breathing and sometimes they can experience coughing, shortness of breath, and tightness of the chest. When people breathe air is sucked into a series of narrower and narrower pathways that guide air into hundreds of millions of tiny air sacs called alveoli. In these sacs blood is replenished with oxygen and carbon dioxide is expelled. Sometimes the air isn't as fresh or clean, it can be filled with pollution, smoke, molds, pollen, pet dandruff, dust particles and etc. For people with asthma these tiny particles can trigger what's called an asthma attack. Things like exercise, food allergies, weather, and even strong emotions can also trigger an asthma attack sometimes. During asthma attacks the lung airways get irritated. When the cells in the lining of the airways detect a trigger like dust they overreact. They release chemicals which increase mucus production and cause the airways to swell. This causes the airway to narrow and makes it harder to breath. People with asthma should always have their inhaler so the medicine in it can reduce swelling in the airways and make it easier to breath. Doctors are really good at treating/ diagnosing asthma and with proper care people with asthma can do just about anything.
Smoking :
Smoking gives you bad breath, makes you cough and can lead to deadly illnesses like emphysema, lung cancer and heart disease. Cigarettes are made of a plant called tobacco and hundreds of chemicals including nicotine, tar, ammonia, and para-methoxybenzaldehyde. Lungs are supposed to take oxygen and distribute it to the rest of your body; by inhaling smoke instead of air it damages the cells in your lungs. The tar in cigarettes literally coats your lungs turning them black over time. It becomes hard to breath and it's more difficult for your lungs to distribute oxygen. Overtime some of these damaged lung cells can become cancerous. In fact smoking is the number one cause of lung cancer. Nicotine is a highly addictive chemical found in cigarettes which narrows your blood vessels and putts added strain on your heart causing all sorts of coronary problems. Nicotine is so addictive that it's really hard to stop smoking once you start. It's a drug and anyone who starts smoking is at high risk of not being able to stop.
Asthma is a pretty common condition of the lungs. People with asthma have trouble breathing and sometimes they can experience coughing, shortness of breath, and tightness of the chest. When people breathe air is sucked into a series of narrower and narrower pathways that guide air into hundreds of millions of tiny air sacs called alveoli. In these sacs blood is replenished with oxygen and carbon dioxide is expelled. Sometimes the air isn't as fresh or clean, it can be filled with pollution, smoke, molds, pollen, pet dandruff, dust particles and etc. For people with asthma these tiny particles can trigger what's called an asthma attack. Things like exercise, food allergies, weather, and even strong emotions can also trigger an asthma attack sometimes. During asthma attacks the lung airways get irritated. When the cells in the lining of the airways detect a trigger like dust they overreact. They release chemicals which increase mucus production and cause the airways to swell. This causes the airway to narrow and makes it harder to breath. People with asthma should always have their inhaler so the medicine in it can reduce swelling in the airways and make it easier to breath. Doctors are really good at treating/ diagnosing asthma and with proper care people with asthma can do just about anything.
Smoking :
Smoking gives you bad breath, makes you cough and can lead to deadly illnesses like emphysema, lung cancer and heart disease. Cigarettes are made of a plant called tobacco and hundreds of chemicals including nicotine, tar, ammonia, and para-methoxybenzaldehyde. Lungs are supposed to take oxygen and distribute it to the rest of your body; by inhaling smoke instead of air it damages the cells in your lungs. The tar in cigarettes literally coats your lungs turning them black over time. It becomes hard to breath and it's more difficult for your lungs to distribute oxygen. Overtime some of these damaged lung cells can become cancerous. In fact smoking is the number one cause of lung cancer. Nicotine is a highly addictive chemical found in cigarettes which narrows your blood vessels and putts added strain on your heart causing all sorts of coronary problems. Nicotine is so addictive that it's really hard to stop smoking once you start. It's a drug and anyone who starts smoking is at high risk of not being able to stop.
Friday, April 16, 2010
Healthy and Unhealthy Foods:
Everybody must know the difference between healthy and unhealthy foods. For a healthy body one must take a well balanced diet rich in proteins, carbohydrates and many different vitamins and minerals such as vitamins C and A, iron and calcium from a variety of foods and anti-oxidants. It is best to include more servings of fruits, vegetables, whole grains, and protein sources in our diet. It is always best to choose what you eat from the bottom of the food pyramid. Go for high green leafy vegetables, citrus fruits, fiber cereals and bread, and increased servings of fruit juices. To determine whether food is healthy or unhealthy we should look at the calories, fat content, salt content, and fibre. Unhealthy foods would be high in saturated fats, sugar, and salt. Unhealthy methods of cooking are deep-frying foods. Instead, try healthier cooking methods, such as boiling, grilling, roasting, and steaming. It is best to limit low-nutrient, deep-fried fast food items, such as pizzas, burgers, fried chicken, potato chips, French fries and sugar laden candies because they lack any of the essential elements such as proteins, fiber, vitamins and minerals. These are examples of Empty calorie foods which are high in calories, but low on nutrition. Unhealthy foods can also cause cancers and diseases from unhealthy fats such as statured fats and cholesterol. Statured fats and cholesterol can block up your arteries and statured fats can effect the blood cholesterol. The best diet is a healthy one has a healthy balance of all types of food in it but correct proportions.
Wednesday, April 14, 2010
Parts of The Digestive System and Their Functions:
Mouth:
1. Mechanical digestion – making food into small pieces easier digest
2. Saliva – chemical digestions carbohydrates sugar
Amylase rice and bread
Slimes, food slide down the esophagus
Esophagus:
Squeezes your food down to stomach.
Stomach:
1. Mechanical digestion – churning food
2. Stores food
3. Chemically digest protein – meat
- Makes acid to help break apart protein (meat)
- Enzyme pepsin
Small Intestine:
Fats – bile from liver/ enzyme lipase
Proteins - finished being digested – pepsin
Carbohydrates – finished being digested enzyme amylase
Digested food protein, carbohydrates, fats go into your blood
Pancreas:
1. Makes all of your digestive enzymes that go into the small intestine
2. Makes insulin which causes your cells to suck up the sugar in your blood
Liver:
1. Makes bile, which goes to the small intestine to help digest fat
2. Filters your blood
Large Intestine (Colon):
- Stores undigested waste food
- Absorbs all your water
1. Mechanical digestion – making food into small pieces easier digest
2. Saliva – chemical digestions carbohydrates sugar
Amylase rice and bread
Slimes, food slide down the esophagus
Esophagus:
Squeezes your food down to stomach.
Stomach:
1. Mechanical digestion – churning food
2. Stores food
3. Chemically digest protein – meat
- Makes acid to help break apart protein (meat)
- Enzyme pepsin
Small Intestine:
Fats – bile from liver/ enzyme lipase
Proteins - finished being digested – pepsin
Carbohydrates – finished being digested enzyme amylase
Digested food protein, carbohydrates, fats go into your blood
Pancreas:
1. Makes all of your digestive enzymes that go into the small intestine
2. Makes insulin which causes your cells to suck up the sugar in your blood
Liver:
1. Makes bile, which goes to the small intestine to help digest fat
2. Filters your blood
Large Intestine (Colon):
- Stores undigested waste food
- Absorbs all your water
What is My MYP Grade?
MYP Grade: 26/36 = 5/7.
Dear Mr. and Mrs. Al Thani,
In this year in Grade eight so far I have had a pleasure getting to know Wadha and have seen her abilities and difficulties in science. I would like to help Wadha improve in science this term and try even harder to show the best of her abilities. I am looking forward to getting to know both you and Wadha more this term. In grade eight students will achieve much this term in terms of academic growth, greater self-confidence, and improved social skills. Good communication between parent, teacher, and student is very important for your child’s academic growth. Students this term will learn about Body Energy: The study of Digestion and, Circulation, and Respiration and how they work together and Power to the People: The study of electricity, how is it made and how it travels through circuits and powers electronic devices.
I would like to briefly discuss homework. While we do have regular homework in Grade Eight I do not give a great deal of homework. On most nights, it should average between 30-60 minutes. Occasionally there will be no homework, and sometimes Wadha will have an opportunity to finish her homework in class. On rare occasions, your child may have more than one hour of homework. Each Day you can expect to find any homework assignments on my wiki: http://rhodesscience.qataracademy.wikispaces.net/, under grade 8 and the unit that we they will be learning. Wadha has completed 11 out of thee 16 homeworks assigned this term and by completing all or most of them next term she can achieve a higher effort grade. The purpose of homework is to reinforce what we have learned in class, and to teach responsibility. When Wadha has done her homework she is prepared in class to hear explanations of what she has had trouble with at home. I have noticed when Wadha doesn't have her homework done she loses both in learning through reinforcement, and in listening to explanations in class. I am also trying, in grade eight, to help students develop good work habits for future years.
Wadha has achieved a good grade this term: 5/7 although she can improve by following very simple steps. Wadha has a major difficulty in her criteria A, D, E and F grade. In criterion A: One world Wadha can improve by describing in detail how science is applied to the issue and describing in detail some of the benefits or limitations rather than describing both briefly. Also, by discussing in detail how science and its applications interact with one of these interactions: social, economic, political, environmental, cultural or ethical factors her criterion A grade can improve incredibly. For criterion D: Scientific Inquiry in Labs Wadha can try to identify both / all the main variables in the RQ and state a valid hypothesis in response to the RQ and using correct scientific language and explain it scientifically. Also, for the Apparatus and method she can try to suggest a complete list of relevant apparatus and procedures which would allow for the collection of the provided data, to allow a fair test of the hypothesis and for her evaluation based on her conclusion, she can reflect on the limitations of the method she has suggested, suggesting improvements and possible extensions which would provide a better test of their hypothesis. This can help boost her Criteria A and D grades dramatically.
For Wadha's criterion E Grade trying to be able to carry out all relevant calculations accurately and to be able to plot a relevant graph accurately is very important to show great data tables and presentations/graphs. Wadha has excellent writing skills and she does use them in her conclusion, but she doesn't follow instructions for an excellent conclusion. For and excellent conclusion she has to form a valid conclusion based on the scientific evidence (referring to patterns and trends in the data with an attempt at explaining these) and which describes to what extent the evidence supports the hypothesis. This way Wadha will have boosted her Criteria A, D and E grades. Although for Wadha's criterion F grade: Lab and Group achievement she needs to try harder with group efforts by discussing in her group during labs and try to come up with great experiments where she can use scientific terminology and try to find out interesting answers and facts. This Wadha can achieve a great effort grade and improve brilliantly with her academic grades.
I hope by following simple strategies and techniques I gave Wadha can achieve a much higher grade and hopefully this can help her in future years in science and maybe other subjects too. If you have any questions or would like to contact me for parents who use e-mail, I normally check my e-mail daily, and this is often the quickest and most efficient way to get in touch with me, or to discuss any of your concerns. I will respond promptly. Please feel free to e-mail me at any time, at: strhodes@qf.org.qa. If you have any special questions or concerns, don’t hesitate to come in any time; or send me a note with your child in the morning, or by e-mail; or set up a conference.
Sincerely,
Stephen Rhodes
Dear Mr. and Mrs. Al Thani,
In this year in Grade eight so far I have had a pleasure getting to know Wadha and have seen her abilities and difficulties in science. I would like to help Wadha improve in science this term and try even harder to show the best of her abilities. I am looking forward to getting to know both you and Wadha more this term. In grade eight students will achieve much this term in terms of academic growth, greater self-confidence, and improved social skills. Good communication between parent, teacher, and student is very important for your child’s academic growth. Students this term will learn about Body Energy: The study of Digestion and, Circulation, and Respiration and how they work together and Power to the People: The study of electricity, how is it made and how it travels through circuits and powers electronic devices.
I would like to briefly discuss homework. While we do have regular homework in Grade Eight I do not give a great deal of homework. On most nights, it should average between 30-60 minutes. Occasionally there will be no homework, and sometimes Wadha will have an opportunity to finish her homework in class. On rare occasions, your child may have more than one hour of homework. Each Day you can expect to find any homework assignments on my wiki: http://rhodesscience.qataracademy.wikispaces.net/, under grade 8 and the unit that we they will be learning. Wadha has completed 11 out of thee 16 homeworks assigned this term and by completing all or most of them next term she can achieve a higher effort grade. The purpose of homework is to reinforce what we have learned in class, and to teach responsibility. When Wadha has done her homework she is prepared in class to hear explanations of what she has had trouble with at home. I have noticed when Wadha doesn't have her homework done she loses both in learning through reinforcement, and in listening to explanations in class. I am also trying, in grade eight, to help students develop good work habits for future years.
Wadha has achieved a good grade this term: 5/7 although she can improve by following very simple steps. Wadha has a major difficulty in her criteria A, D, E and F grade. In criterion A: One world Wadha can improve by describing in detail how science is applied to the issue and describing in detail some of the benefits or limitations rather than describing both briefly. Also, by discussing in detail how science and its applications interact with one of these interactions: social, economic, political, environmental, cultural or ethical factors her criterion A grade can improve incredibly. For criterion D: Scientific Inquiry in Labs Wadha can try to identify both / all the main variables in the RQ and state a valid hypothesis in response to the RQ and using correct scientific language and explain it scientifically. Also, for the Apparatus and method she can try to suggest a complete list of relevant apparatus and procedures which would allow for the collection of the provided data, to allow a fair test of the hypothesis and for her evaluation based on her conclusion, she can reflect on the limitations of the method she has suggested, suggesting improvements and possible extensions which would provide a better test of their hypothesis. This can help boost her Criteria A and D grades dramatically.
For Wadha's criterion E Grade trying to be able to carry out all relevant calculations accurately and to be able to plot a relevant graph accurately is very important to show great data tables and presentations/graphs. Wadha has excellent writing skills and she does use them in her conclusion, but she doesn't follow instructions for an excellent conclusion. For and excellent conclusion she has to form a valid conclusion based on the scientific evidence (referring to patterns and trends in the data with an attempt at explaining these) and which describes to what extent the evidence supports the hypothesis. This way Wadha will have boosted her Criteria A, D and E grades. Although for Wadha's criterion F grade: Lab and Group achievement she needs to try harder with group efforts by discussing in her group during labs and try to come up with great experiments where she can use scientific terminology and try to find out interesting answers and facts. This Wadha can achieve a great effort grade and improve brilliantly with her academic grades.
I hope by following simple strategies and techniques I gave Wadha can achieve a much higher grade and hopefully this can help her in future years in science and maybe other subjects too. If you have any questions or would like to contact me for parents who use e-mail, I normally check my e-mail daily, and this is often the quickest and most efficient way to get in touch with me, or to discuss any of your concerns. I will respond promptly. Please feel free to e-mail me at any time, at: strhodes@qf.org.qa. If you have any special questions or concerns, don’t hesitate to come in any time; or send me a note with your child in the morning, or by e-mail; or set up a conference.
Sincerely,
Stephen Rhodes
The Mouth
The Mouth is the first portion of the alimentary canal that receives food and begins digestion by mechanically breaking up the solid food particles into smaller pieces and mixing them with saliva. The oral mucosa is the mucous membrane epithelium lining the inside of the mouth.
Mouth:
1. Mechanical digestion – making food into small pieces easier digest
2. Saliva – chemical digestions carbohydrates sugar
Amylase rice and bread
Slimes, food slide down the esophagus
Mouth:
1. Mechanical digestion – making food into small pieces easier digest
2. Saliva – chemical digestions carbohydrates sugar
Amylase rice and bread
Slimes, food slide down the esophagus
Tuesday, March 02, 2010
Newton's Three Laws of Motion:
1. An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
2. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
3. For every action there is an equal and opposite reaction.
2. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
3. For every action there is an equal and opposite reaction.
Thursday, February 25, 2010
Thursday, February 18, 2010
Work, Force and machines ( reading + questions )
Page 80. Qu: 1-5:
1. What is mean by :
a) Doing work is when you use force in any way(push/pull).
b) A machine is anything that makes work easier mainly because machines produce a much bigger force that humans.
2. Are you doing work when you are:
a) pushing a mover: Yes, because you are using force to make and object move recurring force.
b)cleaning your teeth: yes, because you're moving the tooth brush to move and clean your teeth correctly.
c)cycling: yes, because force is needed to make the paddle move then using gears and wheels the tires can also move which can make you go a long distance.
d) reading this page : no, because you're not using force to move a certain distance which can't produce any work( measured by joules/dxF) so, you're only using brain power.
3. Why must you eat if you are going to keep working?
- You must eat because any machine needs fuel to work and so our fuel is food which can make us work harder with more energy and we need energy to work in any form.
4. Why are spanners, pliers and can openers called machines?
- This is because by using a small force at one end a much greater force is produced at the other end.
5. Try to find out: the names of other simple machines:
-Lever
-Wheel and axle
-Pulley
-Inclined plane
-Wedge
-Screw
Page 81. Qu: 1-4:
1. What do you need to make a pulley system?
- One or more Pulleys and a rope/cable.
2. Give two reasons why it is easier for a mechanic to lift a car engine out using a pulley system?
- This is because the length of five ropes can each support the engine if the engine is 500n then each rope can support 100n equally.
3. What is the job of:
a) the chain: transmits the force to the back wheels, turning them.
b) the gears on a bicycle: change the number of times that one turn of the crankshaft turns the back wheels.
Page 82. Qu: 1-5:
1. Which simple machines were used:
a) to split the blocks: Wedges.
b) to move the blocks: Rollers.
c) to put the blocks in place: Ramps and Rollers.
2. a) How was friction reduced when the blocks were moved?
- By using the ramps or rollers avoiding the blocks to touch the ground and cause friction.
b)A simple invention, first used 700 years after the pyramid was built, would have reduced friction further. What is it?
- The wheel.
3. (DRAWING)
4. Wedge shaped tools and ramps are still in use. Give some examples of how they are used.
- Wedges:
1. Hold door, bicycle, engine parts in place.
2. Separate objects like blocks of cut stone.
- Ramps:
1. Wheel chars or any rolling objects help people get to higher/lower ground in all indoor facilities (malls).
2. Push or pull heavy object to a higher place ( ex. cars use them to get to another floor in parking areas with more than one floor.
5. How much work had to be done to raise the last block(weighing 25,000N) on to the top of the pyramid?
- A lot more work because the other blocks all were moved to the side or on top of each other, but the last on on top of the pyramid required much more force to push/pull on the ramps/rollers all the way on the top and it was a steep pyramid and the distance was much farther so, it needed more force, distance and work for the final block.
Sunday, February 14, 2010
What a Machine is?
- A machine is any device that does any activity using energy which can also assist or make work easier. A simple machine is a device that helps make work easier; a device that makes it easier to move something, it also transforms the direction or magnitude of a force without consuming any energy. Some simple machines are a wheel, a pulley, a lever, a screw, and an inclined plane. Most machines consist of a number of elements, such as gears and ball bearings, that work together in a complex way. No matter how complex a machine, it is still based on the compounding of six types of simple machines. The six types of machines are the lever, the wheel and axle, the pulley, the inclined plane, the wedge, and the screw.
Tuesday, February 09, 2010
Forces
1.
- A Force is a pull or a push.
2. Examples:
- Friction:
Friction is a force which acts when two objects are rubed together. It acts to the opasite direction to movement. Friction causes objects to heat up and also causes their surfaces to wear away.
- Gravity:
Every object in the Universe attracts every other object in the universe. This invisible force for masses to move toward each other is called Gravity.
When you weight yourself, your weight may be around 30kg to maybe 50kg because of Gravity. Your weight is the result from the product of the force of gravity and the mass of you.Why two masses separated in space have a gravitational attraction to one another remains unknown, despite much research and various theories. These theories are listed on the left.
-Magnetic:
The force exerted between magnetic poles, creating magnetization is known as magnetic force. Every magnet has a north and south pole, just like the earth.Opposite poles attract so the north pole attracts the south pole and the south pole attracts the north pole. Like poles will repel (push away from) each other - so if you place two north poles together or two south poles together they will push each other away. A magnet's strength is strongest at the poles and weakest in the middle. The space around a magnet is called a magnetic field. It is this invisible area where the force of a magnet can be felt. For example, the closer you bring a paper clip to a magnet, the more you will feel the pull of the magnetic field. Just like what you did earlier.
- Nuclear Force:
The protons in the nucleus of an atom are positively charged. If protons interact, they are usually pushed apart by the electromagnetic force. (Remember, opposite charges attract, but like charges repel!). However, when two or more nuclei come VERY close together, the nuclear force comes into play. The nuclear force is a hundred times stronger than the electromagnetic force so the nuclear force may be able to "glue" the nuclei together so fusion can happen. The nuclear force is also known as the strong force. This is one of the four fundamental forces in the Universe. The nuclear force keeps together the most basic of elementary particles, the quarks. Quarks combine together to form the protons and neutrons in the atomic nucleus.
3. The units of force:
- Newtons, Dynes, kilogram-force(kilopond), pound-force, poundal.
More information on Units of Forces.
4. Equation of Force:
- Mass x Acceleration = Force.
- A Force is a pull or a push.
2. Examples:
- Friction:
Friction is a force which acts when two objects are rubed together. It acts to the opasite direction to movement. Friction causes objects to heat up and also causes their surfaces to wear away.
- Gravity:
Every object in the Universe attracts every other object in the universe. This invisible force for masses to move toward each other is called Gravity.
When you weight yourself, your weight may be around 30kg to maybe 50kg because of Gravity. Your weight is the result from the product of the force of gravity and the mass of you.Why two masses separated in space have a gravitational attraction to one another remains unknown, despite much research and various theories. These theories are listed on the left.
-Magnetic:
The force exerted between magnetic poles, creating magnetization is known as magnetic force. Every magnet has a north and south pole, just like the earth.Opposite poles attract so the north pole attracts the south pole and the south pole attracts the north pole. Like poles will repel (push away from) each other - so if you place two north poles together or two south poles together they will push each other away. A magnet's strength is strongest at the poles and weakest in the middle. The space around a magnet is called a magnetic field. It is this invisible area where the force of a magnet can be felt. For example, the closer you bring a paper clip to a magnet, the more you will feel the pull of the magnetic field. Just like what you did earlier.
- Nuclear Force:
The protons in the nucleus of an atom are positively charged. If protons interact, they are usually pushed apart by the electromagnetic force. (Remember, opposite charges attract, but like charges repel!). However, when two or more nuclei come VERY close together, the nuclear force comes into play. The nuclear force is a hundred times stronger than the electromagnetic force so the nuclear force may be able to "glue" the nuclei together so fusion can happen. The nuclear force is also known as the strong force. This is one of the four fundamental forces in the Universe. The nuclear force keeps together the most basic of elementary particles, the quarks. Quarks combine together to form the protons and neutrons in the atomic nucleus.
3. The units of force:
- Newtons, Dynes, kilogram-force(kilopond), pound-force, poundal.
More information on Units of Forces.
4. Equation of Force:
- Mass x Acceleration = Force.
Friday, January 29, 2010
Plant Questions and Wordle:
1. What is a Vascular Plant?
- A Vascular plant is a plant that has lignified tissues for conducting water, minerals, and photosynthetic products through the plant.
2. What structures do all vascular plants share?
- Vascular plants share a similar set of structures called roots, stems, and leaves.
3. What are the roots designed to do?
- The roots are designed to pull water and minerals from whatever material the plant sits on, ex.)Water, soil or branches.
4. What are the two jobs of a stem?
- The two jobs of a stem are transporting food and water and acting as support structures.
5. What is the job of the xylem vessels?
- The Xylem vessels are connected end to end for the maximum speed to move water around. They also have a secondary function of support.
6. What does the pholoem transport?
- The phloem (cells) transport the sugars and other molecules created by the plant.
7. Inside leaves are organelles(tiney organs) called chloroplasts. Inside chloroplasts is a green substance called chlorophyll. What is the job of chlorophyll?
- The job of chlorophyll is that it captures the light from the Sun and start the whole process.
8. In photosynthesis, what molecules combine together to form what compounds?
- In photosynthesis Carbon dioxide and water combine with light (molecules)to create oxygen and glucose (compounds).
Thursday, January 28, 2010
Dessert Ecosystem:
1. Name the producers in the food web.
-Cactus Fruits and flowering plants.
2. Name all the primary consumers in the food web.
-Insects.
3. Name all the secondary consumers in the food web.
-Small mammals, eagles, coyotes, roadrunners, scorpions and lizards.
4. Insects eat a farmer's crop and this same farmer hates rattlesnakes. What would affects the food chain more? The farmer spraying an insecticide that kills all the insects or the farmer going out and shooting all the rattlesnakes he can find. Explans cain your answer.
- Killing all the insects will affect the foodchain more because in his ecosystem allthe insect can eat are his crops and all the rattle snakes can eat are nothing and if the farmer protects himself with long boots etc. he can be safe and still grow his crops with less ants to eat them, but it'll affect the food chain more.
5. A plant produces a seed that sticks to a coyotes fur to get transported away. What kind of relation is this? Mutulism, commensalism or predation. Explain.
- This type of relation is called Commensalism. This is because the two organisms in which one organism gains something but the other does not benefit or suffer harm.
-Cactus Fruits and flowering plants.
2. Name all the primary consumers in the food web.
-Insects.
3. Name all the secondary consumers in the food web.
-Small mammals, eagles, coyotes, roadrunners, scorpions and lizards.
4. Insects eat a farmer's crop and this same farmer hates rattlesnakes. What would affects the food chain more? The farmer spraying an insecticide that kills all the insects or the farmer going out and shooting all the rattlesnakes he can find. Explans cain your answer.
- Killing all the insects will affect the foodchain more because in his ecosystem allthe insect can eat are his crops and all the rattle snakes can eat are nothing and if the farmer protects himself with long boots etc. he can be safe and still grow his crops with less ants to eat them, but it'll affect the food chain more.
5. A plant produces a seed that sticks to a coyotes fur to get transported away. What kind of relation is this? Mutulism, commensalism or predation. Explain.
- This type of relation is called Commensalism. This is because the two organisms in which one organism gains something but the other does not benefit or suffer harm.
Monday, January 25, 2010
Food Web in the Sagebrush-Steppe Ecosystem
Food Web in the Sagebrush-Steppe Ecosystem: (HW):
1. Who eats?
a. Plants? Primary consumers: Squirrels, insects and Pronghorn and other grazers.
b. Snakes? Badger (Carnivores) and Raptor (Large predators).
c. Insects? Lizards, small reptiles and Bats.
d. Mountain lions? No creatures.
2. This can effect the other orgasms in balance because there will be more carnivores, predators and insectivores because there will be less coyotes to eat which can also effect our environment in the balance.
3. The increase of Mountain lions can decrease the amount of other plant eaters and increase the amount of primary producers which could affect the balance of an ecosystem in the increases and decreases of many (different) creatures which can also bother human life styles and could be dangerous.
4. Mesquite trees might have man effects on the ecosystem because hidden in the manure were mesquite trees seeds that have been eaten before so the trees have spread throughout the American dessert southwest. They have lots of roots and are efficient at gathering water out of the soil that other plants cannot germinate. Another is the leaves are edible and produce seed pods that animals eat. Finally, they put nutrients back into the soil because of special nodules on their roots.
1. Who eats?
a. Plants? Primary consumers: Squirrels, insects and Pronghorn and other grazers.
b. Snakes? Badger (Carnivores) and Raptor (Large predators).
c. Insects? Lizards, small reptiles and Bats.
d. Mountain lions? No creatures.
2. This can effect the other orgasms in balance because there will be more carnivores, predators and insectivores because there will be less coyotes to eat which can also effect our environment in the balance.
3. The increase of Mountain lions can decrease the amount of other plant eaters and increase the amount of primary producers which could affect the balance of an ecosystem in the increases and decreases of many (different) creatures which can also bother human life styles and could be dangerous.
4. Mesquite trees might have man effects on the ecosystem because hidden in the manure were mesquite trees seeds that have been eaten before so the trees have spread throughout the American dessert southwest. They have lots of roots and are efficient at gathering water out of the soil that other plants cannot germinate. Another is the leaves are edible and produce seed pods that animals eat. Finally, they put nutrients back into the soil because of special nodules on their roots.
Sunday, January 24, 2010
Van Helmonts Experiment
1. Look up "Quantitative" then explain why this experiment is described as quantitative.
- This experiment was described as quantitative because Helmont's experiment involved measuring, taking data and being careful and accurate which is why it's described as quantitative
2. Write a hypothesis for this experiment as though you believed plants ate soil.
- I think if the plant was eating the soil that would make the soil weigh less because the soil is being eaten away and the plant will grow more, but the soil will weigh less.
3. 3. Explain whether or not your hypothesis was right. Give evidence from the story.
- The hypothesis was incorrect because plants don't eat soil and this was proven because of the weight loss in 5 years is a gram which is barely anything which means there are other possible reasons why the soil weighed less in 5 years.
4. In what ways did Van Helmont try to control the variables of this experiment?
- The plants get the same amount of water each day, that it gets no sunlight, that no insects go near it and that the temperature of the place doesn't change.
5. If plants really did eat soil, what would have happened to the weight of the soil at the end?
- The weight of the soil would be really different and much less than 1 gram.
6. What might of happened to the 0.1 kg of soil which was missing at the end?
- It could have dissolved, dropped of the pot or the weight could've been inaccurate either when first weighed or the second time in 5 years weighed.
7. Where do plants really get their weight from? (Which molecules?)
- Water, sugar, glucose, nutrients, sunlight(energy), carbon dioxide and etc.
8. If you were to do this experiment, what might you do to make it better? (What might you do more of, or measure, and why?)
- I would do different experiments like with different amounts of soil weighed, different amount of sunlight, with different amount of soil and also vary the time it is left to grow as well as the amount and maybe measure the weight of things more frequently
- This experiment was described as quantitative because Helmont's experiment involved measuring, taking data and being careful and accurate which is why it's described as quantitative
2. Write a hypothesis for this experiment as though you believed plants ate soil.
- I think if the plant was eating the soil that would make the soil weigh less because the soil is being eaten away and the plant will grow more, but the soil will weigh less.
3. 3. Explain whether or not your hypothesis was right. Give evidence from the story.
- The hypothesis was incorrect because plants don't eat soil and this was proven because of the weight loss in 5 years is a gram which is barely anything which means there are other possible reasons why the soil weighed less in 5 years.
4. In what ways did Van Helmont try to control the variables of this experiment?
- The plants get the same amount of water each day, that it gets no sunlight, that no insects go near it and that the temperature of the place doesn't change.
5. If plants really did eat soil, what would have happened to the weight of the soil at the end?
- The weight of the soil would be really different and much less than 1 gram.
6. What might of happened to the 0.1 kg of soil which was missing at the end?
- It could have dissolved, dropped of the pot or the weight could've been inaccurate either when first weighed or the second time in 5 years weighed.
7. Where do plants really get their weight from? (Which molecules?)
- Water, sugar, glucose, nutrients, sunlight(energy), carbon dioxide and etc.
8. If you were to do this experiment, what might you do to make it better? (What might you do more of, or measure, and why?)
- I would do different experiments like with different amounts of soil weighed, different amount of sunlight, with different amount of soil and also vary the time it is left to grow as well as the amount and maybe measure the weight of things more frequently
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