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Mountain bike tires are made to go up hills and use friction to its advantage this increases friction and allows the bike to go around less friction grounds.

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- Bike tires come in different shapes and sizes.
- Road tires are smooth and thin this reduces frictio and makes the tire go faster.

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When two surfaces rub heat is created.
If you put oil on brake pads of your bike your brakes would be worse.
When two surfaces rub heat is created because the molecules spin faster.

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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 surfaces molecules to vibrate. This causes heat.

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https://youtu.be/MAqrWvkBoHk

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A lever is a thing used to move something.

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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 pain points.
-The plane effort applied.
-The fixed point the lever.

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-Friction is a force of resistance to the motion of an object.
-Friction happens when two surfaces touch each other.
-In machines, friction occurs where two surfaces slide or roll on each other.
-Some parts of machines are designed to overcome friction .
-Eg Wheels, ball bearings.
-Some machines use oil to lessen friction.

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Friction occurs when Hands go on to the handle bars When The chain and the chain rings connect and when the rubber off the tire connects to the ground