Simple harmonic motion is to and fro motion of object in straight line with small amplitude.
here the force on object must be proportional to displacement from mean position
[tex]F = - kx[/tex]
A) Motion of simple pendulum
Yes it is a simple harmonic motion as it moves to and fro.
B)The motion of ceiling fan
It is not to and fro motion but it is circular motion
C) The spinning of earth on its axis
It is again circular motion on its own axis
D) A bouncing ball on a floor.
It is to and fro motion but it does not follow F = - Kx because here force F = mg
