makes it sound, but it is a fundamental part of physics and

is seen in many forms. Something undergoing simple

harmonic motion moves in a manner, which resembles a

sinusoidal wave having both a crest and a trough. The

object will start from rest, rise to a maximum height and

come to a momentary pause before changing its direction.

It will then fall through its at rest position to a minimum

position which is equal in magnitude to its maximum

position and again come to a momentary pause before

changing its direction to move back to its rest position. It

then repeats the process until outside forces changes its

motion or brings it to a stop.