Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

System of Particle and Rotational Motion

Question:

 Which of the following options is correct for the given diagram? Let the friction coefficient be sufficient for pure rolling.

Options:

Friction force is zero

The sphere is in pure rolling motion

Friction is acting in the direction of velocity of centre of sphere

The motion is not pure rolling

Correct Answer:

The motion is not pure rolling

Explanation:

For the motion to be pure rolling the velocity of contact point must be zero & V = Rw. From the frame of the centre of the sphere, the contact point has a speed of Rw in the forwards direction, so from the ground frame the velocity of contact point is V + Rw in the forwards direction. The sphere is slipping and thus, friction will act in the backward direction against the velocity of contact point.