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Differentiate Between Free and Forced Vibrations . - Physics

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Distinguish Between

Differentiate between free and forced vibrations .

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Solution

Sr.No Free vibrations Forced vibrations
1 Free vibrations are produced when a body is disturbed from its equilibrium position and released. Forced vibrations are produced by an external periodic force of any frequency.
2 To start free vibrations only,the force is required initially. Continuous external periodic force is required. If external periodic force sis stopped,then forced vibrations also stop.
3

The frequency of free vibrations depends on the natural frequency.

The frequency of forced vibrations depends on the frequency of the external periodic force.
4 Energy of the body remains constant in the absence of friction,air resistance,etc. Due to damping forces , total energy decreases. Energy of the body is maintained constant by the external periodic force.
5 Amplitude of vibrations decreases with time. Amplitude is small bu remains constant as long as external periodic force acts on it.
6 Vibrations stop sooner or later depending on the damping force.

Vibrations stop as soon as external periodic force is stopped.

Concept: Free and Forced Vibrations
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