A machine that could run forever. A perpetual-motion machine would have to produce at least as much energy as was needed for its operation. According to the second law of thermodynamics, such a machine is impossible, and to date none has ever been successfully demonstrated.
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Example sentences from the Web for perpetual-motion machine
I wonder what that lady is doing now, and if she knows what she set in motion with Archer?‘Archer’ Creator Adam Reed Spills Season 6 Secrets, From Surreal Plotlines to Life Post-ISIS|Marlow Stern|January 8, 2015|DAILY BEAST
The billionaire philanthropist tastes the product of a machine that processes human sewage into drinking water and electricity.
They were the machine gun bullets coming from the ambush when my company got hit.The Story Behind Lee Marvin’s Liberty Valance Smile|Robert Ward|January 3, 2015|DAILY BEAST
“If BMW is ‘the ultimate driving machine,’ your Anthem is the ultimate differentiator,” writes Hogshead.
But millions of rules result in perpetual error, and, as a terminal side effect, make leadership and accomplishment illegal.
In this situation we waited the motion of the enemy, without perceiving any advancement they made towards us.
These sections also have vibrations of their own which are of shorter length and more rapid motion.Expressive Voice Culture|Jessie Eldridge Southwick
The controlling leaders being out of gear the machine did not run smoothly: there was nothing but friction and tension.Napoleon's Marshals|R. P. Dunn-Pattison
Felipe watched over her as a lover might; her great mournful eyes followed his every motion.Ramona|Helen Hunt Jackson
At six o'clock I felt once more the welcome motion of a Railroad car, and at eight was in Venice.Glances at Europe|Horace Greeley