Choose the correct statement _______.
A. The frictional forces are dependent on the roughness of the surface.
B. The kinetic friction is proportional to normal reaction
C. The friction is independent of area of contact
D. All statements are correct
Answer:D
Choose the correct statement _______.
A. The frictional forces are dependent on the roughness of the surface. B. The kinetic friction is proportional to normal reaction C. The friction is independent of area of contact D. All statements are correct