Question

Friction is large for____________surfaces and small for____________surfaces.

• A. rough
• B. smooth

Answer 1

1. Friction is a force that acts between the surfaces which are in contact. It always opposes the relative motion.
2. Since this acts between the surfaces in contact the nature of the surfaces directly affects the magnitude of this force.
3. The value of friction is large for rough surfaces because of the more irregularities on the surface and less for the smooth surfaces because of the fewer irregularities on the surface.

Hence, Friction is large for rough surfaces and small for smooth surfaces.