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Concepts Of Physics MCQ Edition [Volume 1]PhysicsFriction

Identify the correct statements concerning the friction between two bodies.

Options

  1. AThe limiting friction is always greater than the kinetic friction.
  2. BThe static friction is always greater than the kinetic friction.
  3. CThe coefficient of static friction is always greater than the coefficient of kinetic friction.
  4. 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

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