Define simple harmonic motion and write its important characteristics.

Explanation

The periodic motion of a body about a fixed point on a linear path under the influence of the force acting towards the fixed point and proportional to displacement of the body from the fixed point is called a Simple Harmonic Motion. It is written is short as S.H.M.
It is the simplest form of periodic motion.
The most important characteristic of simple harmonic motion is as below.
..The force acting on a particle executing S.H.M. is always directed towards mean position and proportional to the displacement from it...
Simple Harmonic Oscillator : ..A body performing simple harmonic motion is called Simple Harmonic Oscillator...