The bob of vibrating simple pendulum is made of ice. How will the period of swing will change when the ice starts melting?

Discuss strings stretched between fixed points.

At what displacement
(i) the p. E of a simple harmonic oscillator is maximum
(ii) the k. E is maximum?

Can a motion be oscillatory, but not simple hormonic. If your answer is yes, give an explanation and if not explain why?

Every simple harmonic motion is periodic motion but every periodic motion need not be simple harmonic motion. Do you agree? Give example.