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1. Friction and heat are created when 2 things rub ageist each other.
2.  You would use are rough bike tyre.
3. If you put oil on a bike tyre you would not be able to stop as easily.

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Oils and lubricates on moving metal parts help to:
- reduce friction by allowing the parts slide past each other.
- Absorb some of the heat and spread it away from the touching surfaces.

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When two surfaces rub against one another, the resulting friction causes the surface molecules to vibrate. The creates heat.

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The friction is pushing on the  wheels on a bike. The friction also means that the bike will not fall over. And the brakes too.

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- In machines, friction occurs where two surfaces  slide or roll over each other.
- Some parts of a machine are designed to overcome friction, e.g - Wheels (because they roll), ball bearings and oiled parts

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- Friction  is a force of resistance to the motion of an object.
- Friction  arises when the bumps on the two surfaces collide.

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All levers have 3 components:
- The place where the force is applied (effort point).
- The fixed point the lever rotates on ( pivot point/fulcrum point).
- The load that gets moved (load point).

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Levers are a simple machine. A lever is a rigid bar that rotates about a point.