Friction depends upon

Friction depends upon

Options:

a. nature of the surfaces in contact
b. the normal force acting perpendicular to the contacting surfaces
c. both a. and b.
d. none of the above

Correct Answer: c. both a. and b.

Explanation:

According to the laws of friction, friction is directly proportional to the normal force (N) acting perpendicular to the friction surfaces when an object is in motion. Friction also depends upon the nature of surfaces in contact as various surfaces have various coefficient of frictions. But the friction is not depend upon the area of contact. Also the coefficient of static friction is slightly greater than coefficient of kinetic friction.