Question

Which of the following are the necessary and sufficient conditions for a body to have some angular acceleration about a fixed Axis?

• A. Net external force is non-zero
• B. Net external torque is non-zero
• C. Net external torque is zero
• D. Angular momentum is not conserved

Answer 1

Answer: (B), (D)

The correct options are
B

Net external torque is non-zero

D

Angular momentum is not conserved

Angular momentum changes when there is a net external torque on the body.