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simple pendulum[′sim·pəl ′pen·jə·ləm]
a point mass that as a result of the force of gravity oscillates along a circular arc in a vertical plane. A bob suspended on an inextensible string for all practical purposes can be considered to be a simple pendulum if the dimensions of the bob are very small compared with the length of the string and if the mass of the string is very small compared with the mass of the bob. (See.)