what are causes of friction ?
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caused by interlocking of irregularities in the surface of the two objects which are in contact with each other
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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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