Differentiate between free and forced vibrations .
|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.|
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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