Concepts Of Physics MCQ Edition [Volume 1]PhysicsFriction
Identify the correct statements concerning the friction between two bodies.
Options
- AThe limiting friction is always greater than the kinetic friction.
- BThe static friction is always greater than the kinetic friction.
- CThe coefficient of static friction is always greater than the coefficient of kinetic friction.
- DThe limiting friction is never less than the static friction.
Correct answer
D. The limiting friction is never less than the static friction.
Step-by-step solution
Limiting friction is the maximum possible value of static friction, which means f_ s f_ L . Thus, limiting friction is never less than static friction. For any given pair of surfaces, the coefficient of static friction _ s is always greater than the coefficient of kinetic friction _ k . Since limiting friction is given by f_ L = _ s N and kinetic friction by f_ k = _ k N , it follows that f_ L > f_ k . Hence, limiting friction is always greater than kinetic friction. Static friction is a self-adjusting force that r