The angular momentum of a system of particles | vedclass

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Question

(B) According to the principle of angular momentum, the rate of change of angular momentum $(\vec{L})$ of a system is equal to the net external torque

Vedclass · Accepted Answer

$A$ torque acts on the system.

Vedclass · Answer

(B) According to the principle of angular momentum, the rate of change of angular momentum $(\vec{L})$ of a system is equal to the net external torque $(\vec{	au}_{ext})$ acting on it.Mathematically, $\vec{	au}_{ext} = \frac{d\vec{L}}{dt}$.If $\vec{	au}_{ext} = 0$, then $\frac{d\vec{L}}{dt} = 0$, which implies $\vec{L}$ is constant.Therefore, the angular momentum of a system changes if and only if a non-zero net external torque acts on the system.

The angular momentum of a system of particles changes if:

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