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Question

A simple pendulum having bob of mass $$m$$ and length $$l$$ is pulled aside to make an angle $$\theta$$ with the vertical. Find the magnitude of the torque of the height of the bob about the point of suspension. At which position its torque is zero? At which $$\theta$$ it is maximum?


Solution

Simple pendulum is suspended by here by a rigid support.  Weight =W (Hanging). At angle Theta the total torque is working on the point of suspension.
i=FXr
the weight of bob is W.
i=rXw
-wlsinθ
here the torque direction is perpendicular to the plane hence when the body passes by suspension points then at the lowest point of suspension the given torque will be zero.

=

Physics

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