Question

the force of friction is directly proportional to(factor of moving body)
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Answer 1

Kinetic friction magnitude is directly proportional to the normal force magnitude and the roughness between the sliding surfaces. Static friction magnitude is directly proportional to the normal force magnitude and the roughness between the sliding surfaces.

Answer 2

Answer:

frictional force is directly proportional to load, that is the total force , which act normal to the sliding surface. frictional force for a constant load is independent of the area of the contact.frictional force is independent for the velocity of sliding. frictional force depend upon the nature of material in contact.