Question

| 15. The diagram in Fig. 7.13 shows the displaceme
time graph of a vibrating body.
+a
DISPLACEMENT
Fig. 7.13
(i) Name the kind of vibrations.
(ii) Give one example of such vibrations.
(iii) Why is the amplitude of vibrations gradually
decreasing?
(iv) What happens to the vibrations of the body afte
some time?
.
.
.​

Answer 1

Explanation:

The vibrating body is showing the damped vibration as in the diagram the amplitude goes on decreasing with increasing time.

Damped vibrations are the periodic vibrations of decreasing amplitude in the presence of resistive force. The amplitude of motion decreases due to the friction (or resistive) force which the surrounding medium exerts on the body vibrating it. Due to this resistive force, the vibrating body continuously loses its energy in doing work against the force of friction and so its amplitude gradually decreases.