simple pendulum


noun Physics.

a hypothetical apparatus consisting of a point mass suspended from a weightless, frictionless thread whose length is constant, the motion of the body about the string being periodic and, if the angle of deviation from the original equilibrium position is small, representing simple harmonic motion (distinguished from physical pendulum).

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020