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Friction is the force that opposes the motion of an object
surface finish
temprature can be varied
operation load
relative speed
sliding rolling 
lubricants additions
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Friction is a force that is created whenever two surfaces move or try to move across each other.It can be reduced by 1:-)by polishing 2:-)by using ball bearing 3:-)by using rollers and wheels 4:-)by streamlining 5:-)by lubricating
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