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There are four types of friction. Sliding, Rolling, Static and Fluid

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1. What is created when two surfaces rub together?
Friction and heat.
2.What Kind of Bike tyre would suit riding in a forest? Why?
A grippy type of tyre would be useful to grip to the rough terrain. You wouldn't want to have a very smooth tyre, as you would risk slipping and ending up with injuries.
3.What would happen if you put oil on your brake pads? They would become slippery and the brakes wouldn't work.

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Oils and lubricants on moving metals parts help to:

Reduce  friction by allowing the parts to 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. This creates heat.

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In machines, friction occurs when 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 two surfaces collide.

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Example of a class Three Lever:

Human arms

Tongs

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Example Of a class Two Lever:

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Examples of a class one lever:

Scissors

Staple Remover

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What are they?
Levers are a simple machine. A lever is a rigid bar that rotates about a point.
All levers have 3 components:

The Place where the force is applied (Effort Point)

The Fixed Point the lever rotates on. (Pivot or fulcrum point)

The load that gets moved            (Load Point)