Simple harmonic motion (SHM) is oscillatory motion for a system where the restoring force is proportional to the displacement and acts in the direction opposite to the displacement The time for one oscillation is the period T and the number of oscillations per unit time is the frequency f .

Periodic motion is a repeating oscillation. The angular frequency ω , period T , and frequency f of a simple harmonic oscillator are given by ω = k m , T = 2 π m k , and f = 1 2 π k m , where m is the mass of the system and k is the force constant

oscillation — single fluctuation of a quantity, or repeated and regular fluctuations of a quantity, between two extreme values around an equilibrium or average value. simple harmonic motion (SHM) — oscillatory motion in a system where the restoring force is proportional to the displacement, which acts in the direction opposite to the displacement. simple harmonic oscillator — a device that oscillates in SHM where the restoring force is proportional to the displacement and acts in the direction opposite to the displacement. time for one oscillation — the period T and the number of oscillations per unit time is the frequency f.