Question

Assertion (A): Oscillations and vibrations are almost similar. Reason (R): If frequency is small, we call it oscillation and if frequency is very high, we call it vibration.

Two identical springs of spring constant k are attached to a block of mass m and to fixed supports as shown in Fig.

A particle is performing simple harmonic motion along x-axis with amplitude 4 cm and time period 1.2 sec. The minimum time taken by the particle to move from x =2 cm to x = + 4 cm and back again is given by

Assertion: Resonance is special case of forced vibration in which the natural frequency of vibration of the body is the same as the impressed frequency of external periodic force and the amplitude of forced vibration is maximum. Reason: The amplitude of forced vibrations of a body increases with an increase in the frequency of the externally impressed periodic force.