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1.  When 2 things rub together it makes heat.

2.  What will happen if you put oil on your break pads of your bike  it wont work

3. why is heat caused when to thing rub together  because malecawels are rubing together and are getting hot.

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-Bike tyres come in diffrent shapes and sizes -Road tyres are smooth and thin-this reduces friction and makes the tyre go faster. Mountuon bike tyresmounton bike tyres go faster because there are gears what makes it harder to push the pedel so more friction into the pedels but you can make it easyer to pedel so less friction.

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Oils and lubicant on metal parts help to:
-Reduce the amount of fiction by allawing the parts to slide.

-Absorb some of the heat produced by fiction and spread it around.

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When two serfaces rub on each other the resalting friction causes the surface malecawles to vibrate.
this causes heat

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https://www.youtube.com/watch?v=MAqrWvkBoHk

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-In machines frictions occur where two surfaces slide or roll on each other

-some machines use oil to lesson friction

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-Friction is a force of resistance to the motion of an object

-Friction hapens when two surfaces touch each other

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Levers  are the simplest of all  machines
-A lever is a riged bar that rotats about  a point
-All levers have 3 pain points
-The plane effort is applied
-the fixed point the lever rotats

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Levers are use as something to move heavy stuff how you would do that is like this.