"harmonic motion." YourDictionary, n.d. Web. 17 September 2018. <http://www.yourdictionary.com/harmonic-motion>.
harmonic motion. (n.d.). Retrieved September 17th, 2018, from http://www.yourdictionary.com/harmonic-motion
A periodic vibration, as of a pendulum, in which the motions are symmetrical about a region of equilibrium. Such a vibration may have only one frequency and amplitude or may be a combination of two or more components. Also called periodic motion . Also called simple harmonic motion .