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sliding, rolling, fluid, and static.

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1) What is created when two surfaces rub past each other?

When they rub against each other it creates heat.

2) what kind of bike tyre would suit riding in the forest? Why?

A fat tyre so that you don't fall over when you are going on hills.

3) What would happen if you put oil on your bikes break pads?

it would become slippery

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Oils and Lubricants on mainly metal 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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1. What are they?
They turn things on and off like a light switch.
Levers at the front of a bike used for the breaks.
Triggers.
Down force and up force.

All levers have 3 components.

The place where the force is applied. (effort point)

The fixed point of the lever rotates on.

The load that gets moved

2. What do they do?
Levers are a simple machine.
A lever is a rigid bar that rotates about a point.

3. Different kinds
Class one lever

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Pushing force, motion, friction.

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friction is created when the tyres roll on the road.

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Stacking chairs

Fidget Spinner

Vacuum cleaner

Scooters

Bikes

drawing

Walking

hands

wheels

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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 plants.

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What is Friction?

Friction is a force of resistance to the motion of the object.

Friction arises when the bumps on two surfaces collide.

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Effort point
Fulcrum or pivot point
land point