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bike tyers come in diffrent shapes and sizers
ROAD TIRES are smooth and thin this reduces frictions and makes the tire go faster

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oil and lubricant on metal parts help to reduce the amount of friction by allowing the the parts to slide smoothly
absorb some of the heat produced by frictions and spreed it around

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

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-in machines friction occur where two surfaces slide or roll on each other

-some machines use oil to lesson frictions

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friction is a friction  is a force of resistance
to the motion of an object
-friction happens when two surfaces touch each other

-in machines friction occur where two surfaces slide or roll on each other

-some machines use oil to lesson frictions

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levers are the simplest of all machines
a lever is a ringed bar  that rotates about a point
all levers have 3 main parts
the place where effort is applied
the he fixed point the lever rotates from called the pivot of fulcrum
the place where the thing that is moved is located

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you can use levers to turn things on