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A simple pendulum of length 100 cm performs S.H.M. Find the restoring force acting on its bob of mass

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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. 

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Given :

L = 100cm, m = 50 g = 5 x 10−2 kg, x = 3 cm, g = 9.8 m/s2

Restoring force, F = mg sin θ = mgθ

= (5 x 10−2)(9.8)(3/100)

= 1.48 x 10−2N

 

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