Question

If \(f_{s}\) and \(f_{k}\) represent the coefficients of static friction and kinetic friction of the relative motion between two surfaces in contact with area A, then

• A. \(f_{s}\) depends on A
• B. \(f_{k}\) depends on A
• C. \(f_{s}\) and \(f_{k}\) are independent of A
• D. \(f_{k}\) is greater than the maximum value of \(f_{s}\)
• E. \(f_{k}\) opposes impending motion

Hint:

Friction depends on normal force and surface roughness, not on contact area.

Answer 1

The Correct Option is C