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  4. If applied torque on a system is zero, i.e., τ =0 , then for that system:

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Q. If applied torque on a system is zero, i.e., $ \tau =0 $ , then for that system:

Rajasthan PMTRajasthan PMT 2000

Solution:

$\tau=I \alpha$ (where$ \tau=$ torque )
$I=$ moment of inertia
$\alpha=$ angular acceleration
if $ \tau=0 $
$ I \alpha=0 $
But $ I \neq 0 $
$\therefore \alpha=0$