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Consider the following statements: 1. The kinetic friction is always less than the rolling friction. 2. The kinetic friction is always equal to the rolling friction. 3. The kinetic friction is always greater than the rolling friction. Which of the following statement is correct?

Consider the following statements: 1. The kinetic friction is always less than the rolling friction. 2. The kinetic friction is always equal to the rolling friction. 3. The kinetic friction is always greater than the rolling friction. Which of the following statement is correct? Correct Answer Only 3

CONCEPT:

  • Friction: The property of a surface that opposes the relative motion between two surfaces is called friction.

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Friction (f) = μ N

where μ is the coefficient of friction and N is the normal force

  • There are three types of friction:
Static friction Kinetic friction/sliding friction Rolling friction

The friction that exists between an object at rest and a rough surface on which it is placed, such friction is termed as static friction.

 The friction between the two surfaces when there is a relative motion between the surfaces then it is called kinetic friction. When a block is rolling (usually a circular body like a ball, tire) on a surface then the friction acting is called rolling friction.
The coefficient of friction due to this friction is called a static friction coefficient. The coefficient of friction due to this friction is called a kinetic friction coefficient. The coefficient of friction due to this friction is called a rolling friction coefficient.


EXPLANATION:​

  • In the case of rolling motion, there is no relative motion between the two contact surfaces. So there is no work done by the friction in a rolling motion.
  • That's why the kinetic/sliding friction is more than the rolling friction. So statement 3 is correct.

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