Motion that continues indefinitely without any external source of energy; impossible in practice because of friction.
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"Perpetual motion" Quotes from Famous Books ![]() ![]() — Memoirs of Life and Literature • W. H. Mallock ![]() ![]() — A Tramp's Notebook • Morley Roberts ![]() ![]() — A Series of Lessons in Raja Yoga • Yogi Ramacharaka ![]() ![]() — Betty's Bright Idea; Deacon Pitkin's Farm; and The First Christmas - of New England • Harriet Beecher Stowe ![]() ![]() — The Cruise of the Snark • Jack London |
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