Question

If no external force acts on particle, then which of the following statement is incorrect about particle?

• A. Particle may be at rest.
• B. Particle moves with uniform velocity on linear path.
• C. Particle moves with uniform speed on circle.
• D. None of the above

Answer 1

Answer: (C)

The statement given in option (c) is incorrect and it can be corrected as,
When particle moves in a circle even with uniform or constant speed, it faces an external force towards its centre called centripetal force.
This means, in the absence of external force a particle cannot move with uniform speed in a circle.
Rest statements are correct.