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Question

For the same pair of bodies, the correct relation between different types of friction is:


  1. Static friction > sliding friction > rolling friction.

  2. Sliding friction > rolling friction > static friction.

  3. Static friction > rolling friction > sliding friction.
  4. Sliding friction > static friction > rolling friction.


Solution

The correct option is A

Static friction > sliding friction > rolling friction.


When a body starts sliding, the contact points on its surface do not get enough time to lock into the other surface. So, sliding friction is slightly smaller than maximum static friction. It is always easier to roll than to slide a body over another. So, rolling friction is further smaller than sliding friction. Hence the correct order is: static friction > sliding friction > rolling friction.

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