What are the damped vibrations? How do they differ from free vibrations? Give one example of each.

The diagram in figure below shows the displacement-time graph of a vibrating body.

(i) Name the kind of vibrations.

(ii) Give one example of such vibration.

(iii) Why is the amplitude of vibrations gradually decreasing?

(iv) What happens to the vibrations of the body after some time?

What is meant by resonance? Describe a simple experiment to illustrate the phenomenon of resonance and explain it.

Figure below shows two tuning forks A and B of the same frequency mounted on two separate sound boxes with their open ends facing each other. The fork A is set into vibration. (a) Describe your observation. (b) State the principle illustrated by this experiment.