Question

If a body is in motion, then friction can be:
1. Static friction
2. Rolling friction
3. Sliding friction
Choose the correct option:

• A. 1 and 2 only
• B. 3 only
  
• C. 2 only
  
• D. 2 and 3 only
  

Answer 1

The correct option is D 2 and 3 only


Static friction is the friction that exists between a stationary object and the surface on which it's resting. In other words, static friction is a force that keeps an object at rest.
If the body is sliding, sliding friction acts on the body. If it is rolling, rolling friction acts on the body. A body can be in motion either by sliding or rolling.
Hence, if a body is in motion, then friction can be either sliding or rolling.