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Rolling: the wheels on a bike roll down hills

Sliding: boxes can slide down steep hills.

Static: Static friction is the force required to make an object at rest begin to move

Fluid.: describes the friction between layers of a vicious fluid that are moving relative to each other.

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When two surfaces rub what is created? Heat or friction.

What would happen if you put oil on your brake pads of your bike? It would slip and wont cause friction. Or the brake pads won't work.

Why is heat caused when two surfaces rub on each other? Heat is caused when two surfaces rub because the molecules vibrate and shoot up to the surface.

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Bike Tyre's come in different shapes and size's.

Road Tyre's are smooth and thin - this reduces friction and makes the Tyre go faster.

Mountain bike Tyre's are large and thick.
This increases friction and that allows the bike to stay put on the ground.

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-( oils and lubricant on metal helps to: )
- reduce the amount of friction by allowing the parts to side smoothly.
- absorb some of the heat produced by friction and spread it around.

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when two surfaces rub on each other, the resulting friction causes the surface molecules to vibrate this causes heat.

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What is Friction in Physics? - Science for Kids | Educational Videos by Mocomi

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- Brakes use friction to slow down the wheel.

- When the chain rubs with the other objects to make the wheel spin.

-When the two surfaces meet meaning Wheel and Ground.

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- In machines, friction occurs where 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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Example:

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Example:

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Example:

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Levers are the simplest of all machines.
- A lever is a rigid bar that rotates about a point.

- All levers have 3 Main points:
- The place where effort is       applied.
- The fixed point the lever rotates from called the pivot or fulcrum.  - The place where the thing is moved is located.

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There are levers on the handle bar of a bike to use the brakes. A lever is a firm bar that Rotates up and down about a point.