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Question
A simple pendulum of length 100 cm performs S.H.M. Find the restoring force acting on its bob of mass 50 g when the displacement from the mean position is 3 cm.
Solution
Data: L = 100 cm, m = 50 g = 5 × 10-2 kg, x = 3 cm,
g = 9.8 m/s2
We know that
Restoring force, F = mg sinθ = mgθ
= `(5xx10^-2)(9.8)(3/100)`
`=1.47 xx 10^-2` N
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