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perpetual motion
noun
, Mechanics.
- the motion of a theoretical mechanism that, without any losses due to friction or other forms of dissipation of energy, would continue to operate indefinitely at the same rate without any external energy being applied to it.
perpetual motion
noun
- Also calledperpetual motion of the first kind motion of a hypothetical mechanism that continues indefinitely without any external source of energy. It is impossible in practice because of friction
- Also calledperpetual motion of the second kind motion of a hypothetical mechanism that derives its energy from a source at a lower temperature. It is impossible in practice because of the second law of thermodynamics
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Word History and Origins
Origin of perpetual motion1
First recorded in 1585–95
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Example Sentences
I want to always be in a state of perpetual motion: going somewhere, doing something.
From The Daily Beast
It is a potent part of the Sarkozy brand: he is tireless and in perpetual motion.
From The Daily Beast
The poor soldier had one of those eccentric souls which need perpetual motion.
From Project Gutenberg
I suppose I am growing old, for I begin to dislike perpetual motion.
From Project Gutenberg
Of course, such a doctrine cannot be true; it would amount to a perpetual motion!
From Project Gutenberg
In fact, it is the old story illustrated, that perpetual motion is impossible.
From Project Gutenberg
Or, perhaps, a still more lively illustration to some readers may be the idea of perpetual motion.
From Project Gutenberg
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