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1. It is creating heat.
2. This stops the friction so the brakes won't work.
3. Because the molecules are rubbing together.

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-Bike Tyres come in different shapes and sizes.
-Road tyres are smooth and thin - this reduces friction and makes the tyre go across the rocky surface.

Mountain bike tyres are big, thick and have grips on them this helps with friction which allows the bike to climb up slippery surfaces like dirt or gravel.

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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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Levers are the simplest of all machines.
- A leer us a right bar that rotates about a Point.
- All levers have 3 main parts:
- The place where effort is applied (e)
- The fixed paint the lever rotates from called the pivot or fulcrum. (p)
- The place where the thing that is moves is located. (L)

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I know that a lever is when you try to lift something up that is heavy at lift it off the ground using a contraption like a stump and a metal bar and a heavy log and using the stump as a rest to lift the log