define friction .cause of friction
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Surface resistance to relative motion as of a body sliding or rolling...
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Friction is the resistance to motion of one object moving relative to another .
Causes of friction :-
♥ Adhesion is a molecular force that arises when two materials are brought close to each other .
♥ Surface roughness is a factor in friction when the materials are rough enough to cause serious abrasion .
♥ When one or more of the materials are relatively soft , much of the resistance to movement is caused by deformations or a plowing effect .
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