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In simple harmonic motion, the acceleration of the system, and therefore the net force, is proportional to the displacement and acts in the opposite direction of the displacement.Ī good example of SHM is an object with mass m attached to a spring on a frictionless surface, as shown in Figure. Harmonic Oscillator Oscillation appear when there is a restoring force that acts on the system when it is out of equilibrium trying to bring it back to. Simple harmonic motion is a special type of 1 dimensional (straight line) motion, characterised by its acceleration towards and oscillation about an equilibrium.