Question

The dynamic friction is the friction experienced by a body, when the body

(a) is in motion

(b) is at rest

(c) just begins to slide over the surface of the other body

(d) none of the mentioned

The question was posed to me in examination.

I'd like to ask this question from Friction of Pivot and Collar Bearing in section Friction of Machine Kinematics

Answer 1

Correct answer is (a) is in motion

Explanation: The friction, experienced by a body, when at rest, is known as static friction.

             The friction, experienced by a body, when in motion, is known as dynamic friction.

             The maximum frictional force, which comes into play, when a body just begins to slide over

             the surface of the other body, is known as limiting friction.