Experiments with static electricity

1. On the Gizmo, click Show force vector for charge A and Show force vector for charge B. The forces on each charge are represented by the purple and green arrows. The charges of each particle, qA and qB, are shown below the particles. Check that each charge is set to 10.0 • 10−4 C.

a.Observe the arrows representing the Coulomb force between the charges. Do you think this represents an attractive or a repulsive force?
a. It shows a repulsive force.

b. Change the charge of particle A (qA) to -10.0. (To change qA, type a value in the field next to the slider and hit Enter.) You now have a positive and a negative charge (as in the "hair and balloon" experiment). What effect does this have on the arrows? Is this an attractive or repulsive force?
b. It shows a attracting force.

c. Change the charge of particle B to -10.0. What kind of force is experienced by two negative charges? You can model this by rubbing two balloons and slowly bringing them together.
c. It shows a repulsive force.

d. Change the charge of particle A back to +10.0. As a rule, what kind of force will result when charges are opposite? What kind of force will result when the particles have the same charge?
d. It's an attracting force again, so when two particles are the same charge they repel while if they are different it is the same.

2. Change the charge of particle A to 0.0. A particle with zero charge is neutral.

a. What happens to the force arrows?
a. The force arrows are not there anymore.

b. What is the force between a charged particle and a neutral particle? Try several values for particle B to see if this is always true. (Note: In reality, neutral objects are composed of charged particles. If you bring a charged object near a neutral object, the charged particles within the neutral object will rearrange themselves in a process called polarization. This results in an attractive force between the charged object and the neutral object that is not shown in the Gizmo.)
b. The relationship between neutral and a charged particles in the gizmo, is that there is no more attraction or repulsion. This is the case for both positive and negative charges. In real life though a process called polarization happens.

3. To see the magnitude of the Coulomb force, click Show vector notation for particle A and particle B. The magnitude of the force (in Newtons) is written |FA| or |FB|. Set each charge to 10.0 • 10−4. Click Show distance and Show grid, and drag the particles together until the distance between them is 30 m.

a. What is the Coulomb force on particle A?
a. 10n

b. What is the force on particle B?
b. 10n

c. Drag the particles around. Are the forces on particle A and B always equal to one another?
c.

4. Before altering the charges, write a hypothesis in your notes. What do you think the force will be if one of the charges is halved? When you have written your prediction, change the charge of particle A to 5.0 • 10−4 C and press Enter.

My hypothesis is that the coulomb force will be either a half or quarter less when one of the charges is halved.


a. What is the force on the particles now? Does this agree with your hypothesis?
a. The force on the particles is now 5, so the forces did half.


b. Change the charge of particle B to 5.0 • 10−4 C. What is the force now?
b. The force on the particles is now 2.5, so the forces did half.

c. Try several other combinations of charges. (Stick with whole numbers so it is easier to see the relationship.) What pattern do you see?
c. The fa is half way between the half of the smaller number and the average of the two original numbers.

d. Based on your observations, write an equation for Coulomb force when the distance is 30 m. If possible, compare and discuss your equation with your classmates.
d.

Static Electricity

Static electricity is the electricity formed when negatively and positively charged electrons coliseum and the friction that is created causes static electricity.

Static electricity is used in a number of things:

They are used in paper scanners. Paper scanners apply a negative or positive charge to the surface of where the paper will be applied, then when the paper is placed, light is shun through the paper, and where there is white the light is reflected and the charge on those areas leave, where the paper is not white, the charge stays. Then paper is placed om top of the plate or surface and the opposite charge of the plate charge is applied to the toner, and the toner applies ink where the opposite charge is. Then heat is used to stick the toner with the paper.



Static electricity is used in car spray paints, a charge is placed on the tip of the painter, and the opposite charge is placed on the car, so the paints land evenly on the car.



Static electricity is used in pollution control, where the dust particle in air are given charges and the collectors are given the opposite charge to attract the dust or dirt.

bibliography : "GCSE Science/Uses of Static Electricity - Wikibooks, Collection of Open-content Textbooks." Wikibooks. Wikimedia Foundation. Web. 27 May 2010. .

Circulatory System Quiz Questions

1. What is responsible for pumping blood through your body?

The heart (B).

2. The heart is a type of:

Muscle (A).

3. What makes up your body's circulatory system?

The heart, blood vessels and blood (C).

4. What does blood bring to the cells?

Oxygen and nutrients (A).

5. Where does blood become oxygenated?

In the Lungs (C).

6. What are three types of blood circulation in your body?

Coronary, pulmonary. and systematic. (B)

7. What is coronary circulation?

The circulation of blood in your heart (A)

8. Systematic circulation requires help from:

Arteries and Veins (C)

9. What is the superior vena cava?

A blood vessel (B).

10. What are arteries?

Blood vessels that move blood away from the heart (A).

Respiratory System Worksheet questions 2-8.

2. Pharynx, Larynx, Trachea, Bronchi, Bronchioles, Alveoli

3. Esophagus

4. The nose has many small hairs that sense alien particles, when the foreign particles are detected. they are expelled through the cilia in the nasal cavity.

5. D-B-A-I-G-H-F-E-J

6. C-E-B-D-A

7. T-F (inhale/expand)-T-T-T-F (defuses)-T

8.

Karim and I make a plastic bottle lung

href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaineuanzF-1u4_AxGOovQ9tNZopezSZacM-tlnoUDGJDm9gcFNOqMlVxDriFUuPDfc-0OKvtLTMLPnscaWnxogOhi_1uFZj1QVtWNBBs5t2HyObv3yw-O39KWrCyWj0JR2aYumbFdGSE/s1600/Lung+1.jpg">

Brainpop Smoking and Asthma Videos.

Asthma

Asthma is a disease that can be spread from generation to generation. It can also be caused by some allergies. Asthma is disease that causes asthma attacks. An asthma attack is when your bronchial tubes thin when dust particle go through them and cause them to contract and thus make it hard to breath, as air can't easily pass through. Inhalers are used to breath inc chemicals to stop the bronchial tubes to stop irritating and or contract.

Smoking

Smoking is is the process of inhaling tobacco as a gas and exhaling it through the usage of a cigar or cigarette. Smoking is an addictive habit, and causes many health as well as social problems. The nicotine in cigarettes is what makes smoking addictive. The tar in cigarettes slowly starts to blacken your lungs and in the process kills the skin cells of it, which has a high chance of causing lung cancer. Smoking can cause a myriad of other health problems, because cigarettes have many, many different dangerous chemicals.

Healthy and Unhealthy foods

There are many things that decide whether a food is healthy or not. Firstly you must look at the saturated fat levels in the food, to see how many grams of fat it has. Then you must reason whether the amount of calories it possesses is good for the weight it will add to your body. Then you must check how many vitamins and minerals it has, and if it has empty calories.

Empty calories are calories with minimal vitamins and minerals, and only provide excess calories, so basically their "empty" of what our bodies need.

What is My MYP grade?

My MYP grade for term 2 this year is 7. I am proud to get back to back 7s in science.

If my teacher were to write a letter to my parents about my grade, this is what I think it would be.

"Dear Parents of Shakeer Ahmad 8E,

Your son has been an excellent student this year and has earned the highest MYP grade possible of 7.

He can still do even better in the one world activities and the conclusions in his lab write-ups, and get 6/6s instead of 5/6s in the areas. He should practice activities like this at home.

Thank you,


Stephen Rhodes"

Names of all the parts of the digestive system and their functions

Mouth
Mechanical (Physical) Digestion > chewing food, breaking food into small pieces.
Saliva- chemical digestion > enzymes, amylase in saliva. Take out the carbohydrates.
-slimes food- slide food down the esophagus.
Esophagus
Squeeze the food down to the stomach.
Stomach
-Stores food.
-Mixes food (Mechanical digestion)
-Makes acid- in order to help breakdown protein.
Enzyme pepsin > breaks down protein
Pepsin is made in the stomach
Has a ph 2 in your stomach when you get acid.
Small Intestine
-Fats (lipids)
-Carbohydrates
-Proteins are all finished getting digested (chemical)
-All of these are absorbed into your blood by your small intestine.
Pancreas
Makes all the important enzymes that go to small intestine to digest fats (lipase enzyme), carbohydrates (amylase enzymes) and proteins (pepsin enzymes).
Makes insulin in order for your body cells to suck up sugar (glucose)
Liver
1. Makes bile which is stored in your gall bladder and sent to your small intestine to helo break down fat.
2. Filters the blood from your small intestine.
3. Store sugar so it can be released.

The mouth

The mouth has many abilities to start of the digestion process. It first breaks down the food physical using the teeth. Then it uses saliva to make the broken up food easier to pass through the esophagus, where it will go down to the stomach for chemical break down.

Speed, Velocity and Acceleration Relationships

Speed, velocity and acceleration are all connected. Speed is how fast. Velocity is speed in it's direction. And acceleration is the changes in speed, and the speed of those changes. Terminal velocity is when the velocity stops going in a direction, and heads back to the starting point, and stops, hence the term "terminal". Gravity is a force which makes all objects of mass, to have a certain height above the center of gravity, or grounds of planets. In a car race, speed is how fast the car was going (e.g 150 km/h, velocity 150km/h forward, and acceleration 1-150 km/h in 5 seconds.)

Inclined Plane Worksheet (Group Could Not Finish Sir)

a. length = 0.25 m
height = 0.25 m
1. 3.22
2. i. = 3n
ii.= 1.5n
3. 2n
b. length = 2m
height = 0.17 m
1. 2.85n
2. i. = 3.84 n
ii.= 1.5n
3. 2.56

Speed and Weight on the Moon

I ran 10 meters in 2.75 seconds, and walked 10 meters in 4.01 seconds. I can calculate my speed by dividing my distance by my time (d/t=s). My running speed is 10/2.75 which approx. = 3.63, so my running speed is approx. 3.63m/s. While my walking speed is 10/4.01 which approx. = 2.5, so my walking speed is approx. 2.5m/s.

My weight is different on other planets because the other planets have a different mass to the earth, and have different levels of gravity based on that, to affect my weight.

Newton's Three Laws of Motion

1. All objects in motion, and at rest, will stay in motion, and at rest, respectively, when no force acts on it. All objects in motion, and at rest will no longer be in motion, and move, respectively, when a force is acting upon it.

2. The effect a force has on an object is dependent on the mass, which effects the acceleration. F = ma.

3. For every action there's is an equal and opposite reaction.

What is a machine?

Work is force x distance, and a machine is a mechanical device that makes work easier. Using a machine you can produce work, at higher amounts and faster speeds. Machines relate to work because, they produce it, and force because they exert it on objects when creating work.

Questions from pages 80 (1-5), 81 (1-4), 82 (1-5)

Page 80,

1.
a. Work is using a force to move an object, work = force x distance.
b. A machine is a mechanical device that handles work. A machine is something that makes easier to do.
2. The answers A (pushing a mower), B ( Cleaning your teeth) and C (Cycling) are all work as, you are moving a mower, moving your tooth brush, and peddling your bike respectively.
3. To keep on working, you need energy from chemicals like glucose, to keep on producing force.
4. Spanners, pliers, and can openers, are considered machines, because they make work easier.
5. Tweezers, Cart, and slingshot.

Page 81

1. Pulley wheels and a rope.
2. A pulley system can help a mechanic out, by lifting the car engine up and carrying it across to a car or other area.
3.
a. A chain is used to transfer the force of the peddles and crank shaft to the wheels.
b. The Gears are needed to turn the wheel using the force transmitted by the chains.
4.Cycling in high gear is when a turn of the crank shaft makes many turns of the wheel, while low gear is about a ratio of 1 crankshaft turn: 1 or 2 wheel turns.

Page 82

1.
a.Wedges
b.Rollers
c. Ramps
2.
a.By placing them on a flat surface.
b. The crane
4. Wedges are used for putting feet into tight shoes, and ramps are used to move wheelchair people to move up higher.
5. 140m x 25,000 N = 350,000 J

NUMBER 3

Erin Brockovich - what I learned

In my opinion, the movie Erin Brockovich was bad, and predictable, but the story it is based on is mind blowing. Having seen the side of victims in the movie, researching and representing the opposition (PG&E company) was going to be interesting and a definite eye opener. What I saw in the movie was a bit biased, but I learned loads from what I was shown. We often take our environment, and planet in general for granted, for the furthering of our leisure and elimination of problems we care about. Sometimes this is taken too far, and immediate consequences take place, even for us. In the movie,PG & E dumped dangerous chromium 6 into ponds to save money, which leaked into public water supplies, and the people of Hinkley, CA, have suffered because of that. On the other hand when representing PG & E as lawyers, in defense of a lawsuit caused by the water contamination. I learned the real affects of Cr6 and how the Erin might have changed some of the facts and way she said them. I researched the laws concerning the court hearing, and thought of how Erin could have used the plight of the residents to convince the jury and the judge on only biased ethical and moral grounds, not on full use of evidence. I would conclude that both sides of the conflict and valid points, and showed how people can use science and slight deception to convince people one way or the other. But more importantly how mankind must think for the environment and other people, for the present and future before doing anything that may affect those.

Forces (number 3 on wiki)

A force is a physical influence that is caused by the laws of physics. Here are for common forces; gravity, gravity is the gravitational pull of the Earth that pulls all things to the center, or close to as it, like the ground above the surface. The more weight that something the stronger the gravitational pull that the Earth has on the things. Air resistance,when a object goes through the air, it has friction with the air, and this forces the object to move slower if it is moving, as it makes going through harder. Mechanical force, is force made by a machine that makes work (force x distance). Drag, the force that is made when a object rips through the air, and air resistance slows a object going down and makes the process of going down look like the object slightly being dragged back up a little. Forces are measure in newtons. Force = mass x acceleration.

Homework 19-1-2010

1. Cactus Fruit, Flowering Plants

2. Rattlesnake (show in image as secondary, sorry) Small Mammals, Insects

3. Lizards, Scorpions

4. If a farmer shoots all the rattle snakes in the area, it would effect the food chain much, much more than if he killed all the insects as all 3 of the top predators rely on it as well as lizards as food.

5. If a plant makes seeds that stick to a coyotes fur, and the coyote carries it, the relationship is commensalism as the plant benefits from its population being spread, while the coyote is unaffected.

Homework 18/1/2010

1. a. Squirrels and other small rodents, insects, pronghorns and other grazers.
b. Raptors and Badgers.
c. Lizards, small reptiles and bats.
d. (none)

2. Coyotes are on the top of the food chain, shooting them would result in the lizard population becoming much higher. Thus making the insect population much lower, and cutting down the bat's food. At the same time making the raptor population much higher due to the lizards, and would make populations of all the animals the raptor eat lower and making the animals eat by those higher, and this process would only stop all the way at the bottom of the food chain, with the plants.

3. If mountain lion populations increased, pronghorn populations would start to lessen, making coyote populations lower, and effecting all the other animals it ate, and would effect everything down to the producers.

4. A new or more producer(s) would making primary consumer populations higher and making all the consumer stages above them higher.