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When two surfaces rub what is created?
When two surfaces rub heat is created.

What would happen if you put oil on the break pads on your bike?
If you put oil on your break pads when you break the oil would allow it to keep spinning.

Why is heat caused when two surfaces rub on each other.
Heat is caused because of surface molecules to vibrate this creates heat. The more molecules the bigger the shape is. If it is cold it still has molecules just they are moving slower than heat molecules.

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Bike tyres come in shapes and sizes.
Road tyres are smooth and thin- this reduces friction and makes the tyre go faster.

Quad tyres are thick - this increases friction and that allows the quad to gain more traction.

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

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Book Friction - Cool Science Experiment!

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1. Bikes show friction when the wheel rolls and meets the ground.

2. Another point of friction is the brake pads when they rub on the wheel and stop the bike from rolling.

3. Another point of friction is the chain meeting with the sprocket and every time that turns it creates friction.

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1. In machines, friction occurs when two surfaces slide or roll against each other.

2. some parts of a machine are designed to overcome friction. EG: wheels, ball bearings.

3. Some machines use oil to lessen friction.

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1. Friction is a face of resistance to the motion of an object.

2. Friction happens when two surfaces touch each other,

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Simple example of class 1, 2 and 3 levers.

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Simple example of class 1, 2 and 3 levers.

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Effort, load and pivot.

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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 parts:

1. The place where effort is applied.

2. The fixed point the lever rotates from call the pivot or fulcrum.

3. The place where the thing that is moved is located.

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Levers:

I know that a lever can be used to lift something but it needs to be on top of something otherwise it won't be able to lever it up. The longer the lever is the easier it is to lift an object but the more likely it is to snap.

Friction:

Friction is 2 objects coming together and they may not move easily. If you put a lubricant between them they are much easier to move.

Force:

Force is when you push or put effort into moving something