Question

what is the cause of friction​

Answer 1

$\huge\mathfrak\red{causes}$

》》it 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

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 .