Question

If applied torque on a system is zero, i.e., $\tau =0$, then which of the following must be zero?

• A. $\omega =0$
• B. $\alpha =0$
• C. $J=0$
• D. $F=0$

Answer 1

The correct option is B $\alpha =0$

$\tau =I\alpha$

If $\tau =0$, then $\alpha$ has to be zero.