An object of mass m is tied to a thin string, | vedclass

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(A) When the string is pulled downwards,the force applied by the hand acts along the radius of the circular path (towards the center). Since the force

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Angular momentum

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(A) When the string is pulled downwards,the force applied by the hand acts along the radius of the circular path (towards the center). Since the force is radial,the torque $\vec{	au} = \vec{r} 	imes \vec{F}$ about the center of the circle is zero because the angle between the position vector $\vec{r}$ and the force $\vec{F}$ is $180^{\circ}$ (or $0^{\circ}$ depending on the reference). According to the principle of conservation of angular momentum,if the net external torque acting on a system is zero,the angular momentum $L = mvr$ remains conserved. Therefore,the angular momentum of the object remains constant.

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