Differentiate between free and forced vibrations.
Distinguish between free vibrations and forced vibrations (Two points).
|Sr.No||Free vibrations||Forced vibrations|
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 is 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||The energy of the body remains constant in the absence of friction, air resistance, etc. Due to damping forces, total energy decreases.||The energy of the body is maintained constant by the external periodic force.|
|5||The amplitude of vibrations decreases with time.||Amplitude is small but remains constant as long as an 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.
Students can refer to any two points among them.
Concept: Free and Forced Vibrations
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