Question

When the angular acceleration of a rotating body is zero, which physical quantity will be equal to zero?

• A. Angular momentum
• B. Moment of inertia
• C. Torque
• D. Radius of gyration

Answer 1

Answer: (C)

Torque

Torque acting on the rotating body $\tau =I\alpha$

where $I$ is the moment of inertia and $\alpha$ is the angular acceleration of rotating body.

As $\alpha =0$

We get $\tau =0$

Thus no torque acts on the body whose angular acceleration is zero.