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What is difference between free and forced oscillations

Free Oscillations:

A body is said to be executing free vibrations when it oscillates without the interference of an external force.For example,when simple pendulum is slightly displaced from its mean position vibrates freely with its natural frequency that depends only upon length of pendulum.

Forced Oscillations:

If an oscillating system is subjected to an external periodic force,then forced vibrations will take place.For example,the mass of a vibrating pendulum is struck repeatedly,the forced vibrations are produced.

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