3(iii)
(a) Define natural vibrations.
(b) How is this vibration different from damped vibrations in terms of their amplitudes?
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(a) The periodic vibrations of a body in the absence of any external force on it, are called natural (or free) vibrations.
(b) In natural vibrations, the amplitude remains constant because there is no loss of energy while in damped vibrations, the amplitude gradually decreases with time due to energy loss caused by the presence of resistive force.