In physics,

**simple harmonic motion**(

**SHM**) is a periodic motion that is neither driven nor damped. An object in simple harmonic motion experiences a net force which obeys Hooke's law; that is, the force is directly proportional to the displacement from the equilibriliium position and acts in the opposite direction of the displacement.

A simple harmonic oscilattor is a system which undergoes simple harmonic motion. The oscillator oscillates about an equilibrium position (or mean position) between two extreme positions of maximum displacement in a periodic manner. In fact, the motion of the oscillator can be described by means of a sinusoidal function. Mathematically, the displacement from the equilibrium position

*is given by*

**x***A*is the amplitude which is the maximum distance from the equilibrium position (in SI units*m*);*ω*is the angular frequency which is a multiple of frequency*f*, and*ω*= 2*πf*(in SI unit:*s*^{-1});*φ*is the phasewhich is the elapsed fraction of wave cycle.

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