what are the causes of friction in points
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The causes of the resistive force offriction are molecular adhesion, surface roughness, and the plowing effect. Adhesion is the molecular force resulting when two materials are brought into close 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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