First slide
Forced oscillation
Question

A particle with restoring force proportional to displacement and resisting force proportional to velocity is subjected to a force \large F\sin \omega t. If the amplitude of a particle is maximum for frequency \large \omega \, = \,{\omega _1} while the energy is maximum for the frequency \large \omega \, = \,{\omega _2} then (where \large {\omega _o} = natural frequency of oscillation of particle)

Moderate
Solution

In forced vibration, amplitude of oscillation is given by

A=F0mω02-ωe2+ωe2bm2

Amplitude when ω02-ωe2 =0     ω0=ωe

Here ω0= Natural frequency of oscillation

ωe= Frequency of external periodic force.

Again, energy of oscillation A2

\large \therefore \,{\omega _1}\, = \,{\omega _2}\, = \,{\omega _o}

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