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. The arrows are pointing away which means it is repulsive.

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 an attractive force because the arrows are pointing to each other.

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. The arrows are pointing away which means it is repulsive

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. When the forces are the opposite it is an attracting because the arrows are pointing to each other, however when the charges are the same, it is a repulsive force because the arrows point away.

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 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. 10

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

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


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.

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.

Healthy and Unhealthy food can be pointed out easily on a one factor. The factor is 'did the human interfere with the food'.in another words, any food that does not grow naturally or it is modified by the human is 99.5% of the time bad for aside from medicine and other medical substances. For example, the food that is restaurants and especially fast food restaurants intend to always get taster, and since our bodies like certain substance, they increase it to make us like it. Even though it might contain some fats or nutrients that are good for you, yet too much is not good. Our bodies like fats, in most of the restaurants, if you check you can find the amount of oil they use is incredible. it contains more calories than you need for one day. Worse than that, If you eat too much fat, it will be left behind in your body damaging it and blocking your blood vessels which gives a high blood pressure and a high chance of heart attack. However, the healthy food is the vegetables and fruits. Even though the human interfered with them, yet he only changed a sentence in the book unlike fast food. The healthy food contains fibers that is not digested but it is used for cleaning your digestive system and scrub the waste food and preventing it from being attached to your large intestine and blocking the way. The healthy food also contains high amounts of nutrients and proteins. It contains low fat and calories rates which makes it easier to eat a lot of them and not worrying about your health. However, the can food or fast food sometimes contains 0 protein and nutrients and very high amounts of fat and calories which also helps in gaining weight. The fast food also contains a lot of fat that soon becomes addictive and it can lead into bad habits.

From my point of view, home made food is the best (at least for me). In my house we put a lot of vegetables in our food and some meat that is always heated or boiled with water and rarely fried with oil for one minute or less to give crispy taste or to make it taste better. We also avoid acidic drinks such as Pepsi and especially Fanta and other colored, sugar flavored drinks. instead we either make our own juices or if we were lazy we would drink the juices bought from a store which are better than acidic drinks.

the parts of the digestive system and their functions

The mouth is the where the first stage of chemical and mechanical digestion to take a place. The mouth uses mechanical digestion by the healp of the four sets of teeth which are the incisor (front teeth and it is used for cutting), the canines (the tooth after the incisor which is usually sharper than the other teeth and it is used for percieng and tearing), the premolars and molars which are used for crushing and grinding nd the tongue which is used for moving the food around. The chmical digestion take place when your salaviary glands produce salavia which helps to soften the food. The food is also covered with a layer of salavia to make it easier to swallow down the esophugas. Also the chemical digestion happens when enzymes are produced. These enzymes are used to break down starch.



The Esophugas is a tube that contains muscules on the walls/sides that push the food down to your stomach in a wavelike motion. This motion is called presitalsis.



The Stomach is ina shape of a bag. The stomach walls/sides contain mescules that move the food and mix it. The stomach produces stomach acid that helps in the chemical digestion and it also produces pipsogen and hydrochloric that mix and turn into an enzyme called pepsin. The pepsin however does not take place in stomach, it is sent to the intestine to breakdown proteins. In addition to breaking down food, it also releases strong acids that kills any swallon bacteria. The stomach walls produce mucus lining on the walls that help to protect against the asrong acids and enzymes.

The Intestines is responsible for absorbing all the nutrients in the food. The food is broken down into a liquid before it reaches your small intestine so it can be absorbed and merged to blood. The small intestine also have many folds that help to increase the surface area and help the liquid to flow easier. The blood vessels surround the small intestine which makes it possible for the blood to carry nutrients, proteins, fats, etc to the body.

The Large intestine Is responsible for taking the waste products and absorbing th water out and then eject it out of the body.

What is My MYP Grade

This unit we worked on feel the force unit where we discover how newton's three law of motion affect us and how simple machine operate. Ahmed did well in his eassay and his tests describing the functions of simple machines and communicating Newton's laws. He also showed an outsanding understanding of the subject. He however, need to improve more on his homework

The Mouth

The mouth is where the first stage of mechanical and chemical digestion happen. Mechanical digestion happen when you collapse booth of your teeth sets together and chew the food. The tongue also helps in the mechanical digestion by movinbg the food around. Chemical digestion happen when saliava start merging with the food to soften it and cover it with a slim cover that helps it to slide down easier. The mouth also is used for realeasing the air that is trapped inside you and it is used for speaking as well.

Newton and three laws of motion

Newton's three laws of motion where created when an apple fell on his head. The first law of motion is when an object is in motion, it will always stay in motion. On the other hand when an object is at rest,it will always stay at rest unless a force acts on it. when an object is moving, all in it and on it will move in the same speed. If the object suddenly stops, the other objects will keep on moving until stopped by another force acting on it. Even though it was said by newton if an object moves, it will remain moving does not happen in our world is because of friction. Friction is produced when two rough surfaces rub together.

The second law of motion is when an object has an unbalanced force acting on it will accelerate in the direction of that force. An example is when you are sitting on the top of a slide. You will not move because gravity is pulling you down, on the other hand the slide is pushing you up which cancels out the forces. But if you push, you will then slide down because even though the air resistance is acting on you along with friction,the majority of force is gravity because you are on a slope and so you will use your mass to gain more speed and gravity advantage.


Newton's third law of motion is forces always occur in equal and opposite pairs. So if you are pushing a door, the door will move and you will move as well. That does not happen because of the friction between our feet and the floor which combines your mass with the floor's or building's mass. However, if you tried it with your roller skates, you will go back because there is less friction happening since roller skates have less rough surfaces and since its a small wheel, there is less surface touching ot making a contact with the floor which reduces the amount of friction.

Simple Machines

Work and machines

1- What is meant by doing:
a- Work: Is using a force to move an object.
b- Machines: Is anything which makes work easier to do.

2-Are you doing work when you are:
a-Pushing a Mower: Yes because you are transferring energy from one object to another.
b-cleaning your teeth: Yes because you are transferring energy from your arm to the brush while you move it up and down.
c- Cycling: Yes because you are moving your legs in a circular motion to transfer your energy from your body to the bike.

3-Why must you eat if you are doing work?
Work is transferring your energy from your body to the certain object. Because Work consumes energy, you will need a replacement for it and so food can be made into energy after being digested and through your intestines to merge with your blood and become energy.

4- Why are spanners, pliers, and can openers called machines?
Since machines are any device or anything that makes work easier, the following objects do make work easier. For example, it is easier to use can opener rather than smashing it or opening it with your hands.

5- Give other names of simple machines.
Knife, scissors, cutter and screw drive.

Pulleys, gears and other wheels

1- What do you need to make a pulley system?
To make a pulley, it is required to have two wheels and a rope, a hooker to hang it from up on a ceiling or anything equivalent.

2-two examples of why it is easier to lift an engine with a pulley.
first reason is when he pulls the pulley down, it is easier to pull down rather than lifting it up to your chest
second reason is when you pull down, you are using your weight as well rather than your arm force only. This way the weight or pressure distribute on some parts of your body and will give you a boost for your force.

3- What is the job of:
a) the chain:The chain's job is transfer the power that is generated by your legs moving the peddles to the wheels in the bike.
b) The gears on a bicycle: The cycle's gear changes the number of times that one turn of the crankshaft turns the back wheel

4-What is the difference between the cycle in high gear and low gear?
In high gear, the chain runs over a small cog wheel where it reduces the speed however, it increases the amount of turns and decreases the force you have to do. It is used for low roads, or in streets. In low gear, the chain uses the bigger cog wheel where it decreases the amount of turns and increases the force you have to do and increases your speed. It is used in high roads, mountains or simply when you need to speed up.

5- Other uses of pulleys??

Pulleys can be used to lift heavy weights to to the top. For example if you were trying to lift up an air-conditioner to the roof, you might think of using the pulley to ease your work. Pulleys are also used in theater where it is hooked to the curtains as well as our houses.

Building a pyramid