Question

what causes friction ?

Answer 1

Causes of Friction. Friction is a force that resists the relative motion between two objects or materials. The causes of this resistive force are molecular adhesion, surface roughness, and deformations. Adhesion is the molecular force resulting when two materials are brought into close contact with each other.

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Answer 2

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 .