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Which one of the following is an example of the force of gravity of th

June 1, 2025 by rawan239

Which one of the following is an example of the force of gravity of the earth acting on a vibrating pendulum bob ?

Applied force

Frictional force

Restoring force

Virtual force

This question was previously asked in

UPSC NDA-1 – 2018

Download PDF Attempt Online

When a pendulum bob is displaced from its equilibrium position, the force of gravity acting vertically downwards, combined with the tension in the string, results in a net force that pulls the bob back towards the equilibrium position. This force, which is always directed towards the equilibrium position and proportional to the displacement (for small angles), is known as the restoring force.

In simple harmonic motion, the restoring force is crucial as it is responsible for bringing the oscillating system back to its equilibrium state. For a simple pendulum, the component of gravity tangential to the arc of motion provides this restoring force.

Applied force is a general term for any external force. Frictional force opposes motion. Virtual force (or fictitious force) appears in non-inertial reference frames. Gravity itself is the fundamental force involved, but its component acting along the path of motion towards equilibrium is the restoring force in the context of oscillation.

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