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Forces - Coggle Diagram
Forces
Contact forces
Friction
Runners shoes and running tracks are designed so that there is a lot of friction. This is so that when the runners are running they are not sliding which would be considered a tripping hazard and could be dangerous. They do this by using synthetic track surfacing made of polyurethane which is quiet rough. The shoes also have lots of little spikes on the bottom to reduce slipping.
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An Example of this is when you are pulling or pushing a heavy object. If you are pushing or pulling it along a carpet than it is going to be harder and need a lot more effort will be needed to move it then if you were moving it along a flat and smooth surface. This is because it is smother and therefore it slides much more easily and smoothly.
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Twist
An example of twisting is when you are ringing out clothes when they are wet to remove water. To remove the water you roll each end of the piece of clothes. This is twisting.
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Twisting is when force is used to turn something in a circular motion. It can be clockwise or anti clockwise.
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Push
An example of this is pushing a shopping trolley around the supermarket. You are moving the shopping trolley in the opposite direction to your self.
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Pushing is when the item causing the force, is moving the an object in the opposite direction
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Pull
An example of pulling is tug of war. There are two teams both pulling as hard as they can. The winner is the team who can pull the rope the hardest. Both teams are pulling as hard as they can.
It is scientifically proven that it is easier to pull than to push because when you push you add more body weight on to the object which causes more friction.
When the item causing the force, is moving the force in the direction of itself. In other words moving the force towards its self
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Normal
When you drop a tennis ball and it bounces, that is normal force. if there was no normal force the ball would just hit the ground and stay there.
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A normal force is basically the opposite of gravity. It is the force that stop gravity from crushing things. It is the force that supports the weight of an item when sitting on a table.
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Non-contact forces
Gravity
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Roller coasters are build on gravity. only the smallest parts are mechanical, such as the parts where the roller coaster has to move up a steep upward ramp. This is why building roller coasters is not easy. There is a lot of science and testing when building a roller coaster.
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The cause of gravity is unknown, but it was discovered by Isaac Newton. Legend has it, when Newton was a young boy, an apple landed on his head which supposedly prompted him to come up with his law of gravity. Although his family was friends with a family that owned an apple orchard.
Magnetism
If you drop a bunch of paper clips all over the ground and then spread them out and then hover a magnet over them, all of the magnets should still unless your magnet is too weak. The magnet is applying force to the paper clips that is lifting them up towards the magnet.
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Magnets always have to poles; north and south. The only combination that attracts is north and south, any other combinations will repel. Even if you cut a magnet in half it will still have two poles.
Electrostatic
When a balloon is rubbed against hair, electrons move from the hair to the rubber, and it gives the balloon a negative charge, and leaving the hair with a positive charge. As the balloon is pulled away, the opposite charge on the hair causes it to be attracted to the balloon.
Trampolines have the same reaction as balloons when coming into contact with hair that is why it sometimes goes all frizzly. Sometime you can get shocked on a trampoline and that is just another reaction/
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