what is SHM not more then 30 words?
SHM (Simple harmonic motion) is a type of oscillatory motion in which acceleration is directly dependent on the displacement from a mean position, i.e. a = -?2x
In general, displacement is given as: x = A sin (?t +?0)
Here, ? is the angular frequency, A is the maximum displacement (or, amplitude) and ?0 is the initial phase.