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Static: Static friction works when for example you rub your socks on the trampoline or carpet or even touching an old tv

Sliding: Sliding friction happens when for example you rub your hands together.

Rolling: Rolling friction happen for example ball bearings roll in machine.

Fluid: Fluid friction happens when fluid rubs on something.

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1. When two surfaces rub what is created? Heat is created when two surfaces rub
2. What would happen if you put oil on the brake pads on your bike? The brakes would do nothing or near to nothing to stop the bike tire from spinning.
3. Why is heat caused when two surfaces rub on each other? Heat is caused because the molecules rub together and cause friction which then again causes heat.

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- Bike tires come in different shapes and sizes.
- Road tires are smooth and thin - this reduces friction and makes the Tyre go faster.
- Mountain bike tires are big to create more friction to be able to climb objects, dirt and terrain easier.

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- Oils and lubricant on metal parts help to
- Reduce the amount of friction by allowing the parts to slide smoothly
- Absorb some of the heat produced by friction and spread it around.

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- When to surfaces rub on each other, the resulting friction causes the surface molecules to vibrate.
This causes heat.

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Places where friction takes place
- Brakes when you pull handle wire puts rubber on tire and tire stops
- Seat when you sit on the seat.
- Chain and the sprocket when the chain goes around.

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-  In machines friction occurs when two surfaces slide or roll on each other
- Some parts of a machine are designed to overcome friction.
Eg - Wheels, Ball Bearings
- Some machines use oil to lessen friction.

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-  Friction is a force of resistance to the motion of an object.
- Friction happens when two surfaces touch each other.

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Levers are the simplest of all machines

All levers have three main points
- The place where effort is applied (E)
- The fixed point where the lever rotates from called the fulcrum (P)
- The place where the thing that is moved is located (L)

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I know that levers are something that is pulled on or weight is put on to activate or move something.