Distinguish between free and forced vibrations.
Q.7 Distinguish between free and forced vibrations.
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Answer:
| Free vibrations | Forced vibrations |
|---|---|
| 1. The body vibrates on its own after being disturbed once, without any external periodic force. | 1. The body vibrates under the action of an external periodic force. |
| 2. The frequency is the natural frequency of the body, decided by its own properties (dimensions, elasticity, tension etc.). | 2. The body vibrates with the frequency of the external periodic force, not its natural frequency. |
| 3. The amplitude decreases gradually (due to damping) and the vibrations stop after some time. | 3. The amplitude remains constant as long as the periodic force acts; it is maximum when the forcing frequency equals the natural frequency (resonance). |
| 4. Example: a plucked string, a simple pendulum displaced once. | 4. Example: the sounding board of a musical instrument, a table top on which a vibrating tuning fork is pressed. |
Doubtly AI
· 28 Oct 2026
AI-verified · Oct 2026
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