Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Laws of Motion

Question:

Consider a marble rolling on a perfectly smooth surface with a uniform velocity. Which of the following is true ?

Options:

It will come to rest after some time.

External force is needed to keep rolling the marble.

External force is needed to stop rolling the marble.

Both (b) and (c).

Correct Answer:

External force is needed to stop rolling the marble.

Explanation:

By Inertia of Motion, the marble will continue to run on the smooth surface until and an external force acts on it and changes its state of uniform motion.