Physics Simple Harmonic Motion (Oscillations) Superposition of S.H.M’s and Resonance Single Correct MCQ
Published on: September 12, 2026

A simple pendulum is set into vibrations. The bob of the pendulum comes to rest after some time due to

A
Air friction
B
Moment of inertia
C
Weight of the bob
D
Combination of all the above

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Text Solution

Verified by Experts
The correct answer is:
A
In a simple pendulum, the bob oscillates back and forth under the influence of gravity. Over time, the motion of the bob decreases in amplitude due to the dissipative forces acting on it.
  • Air friction: As the pendulum swings, it encounters air resistance, which opposes the motion. This friction dissipates energy in the form of heat, leading the bob to gradually lose kinetic energy and come to rest.
  • Moment of inertia: While the moment of inertia affects the angular momentum of the bob, it does not directly cause the pendulum to come to rest. It mainly affects how the pendulum swings rather than the energy loss.
  • Weight of the bob: The weight of the bob provides the restoring force to bring it back to the equilibrium position but does not cause the motion to cease.
Therefore, the primary factor causing the pendulum to come to rest is air friction.
Consequently, the most accurate answer is Option A.

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