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Question

A simple pendulum of length l is pulled aside to make an angle θwith the vertical. Find the magnitude of the torque of the weight w of the bob about the point of suspension. When is the torque zero ?


Solution

A simple pendulum of length l is suspended from a rigid support. A bob of weight W is hanging on the other point. When the bob is at an angle θ with the vertical then total torque acing on the point of suspension.

                            τ=F×r

                      τ=ω r sin θ=ω l sin θ 

At the lowest point of suspension, the torque will be zero as the force acting on the body passes through the point of suspension.

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