Which of the following statements about static friction is correct? It
A
is independent of the nature of the surface in contact
B
depends on the area of surface in contact
C
depends on the relative motion between the surface in contact
D
depends on the weight of the moving body
Verified Correct Answer: D.
Physical Principles & Numerical Solution
The maximum force of static friction (\(f_{s}\)) is directly proportional to the normal reaction force (\(R\)) pressing the two surfaces together (\(f_s = \mu_s R\)). On a flat, horizontal surface, the normal reaction force is exactly equal to the weight of the body (\(R = mg\)). Therefore, static friction depends directly on the body's weight.
Source: Myschool Past Questions Archive (Record #35260)