Describe simple harmonic motion

Simple harmonic motion is a special case of periodic motion.

SHM results when the magnitude of the restoring force exerted on an object is proportional to that object’s displacement from its equilibrium position.

A restoring force is a force that is exerted in a direction opposite to the object’s displacement from an equilibrium position.

An equilibrium position is a location at which the net force exerted on an object or system is zero.