Are perpetual motion machines possible?
A wheel that spins forever; a bird that never quenches its thirst; a
clock that never stops ticking, an endless source of free energy. These
are but the dreams of inventors striving to make perpetual motion
machines, machines that can work forever without any energy input. Are
these machines possible without violating the laws of physics? No.
Actually,
what is impossible is a perpetuum mobile which is a machine or system
that breaks the first or second law of thermodynamics. Planetary motions break none of those laws, therefore there is no contradiction with their "perpetual motion". The question of the end of Earth's orbit is a different one though.
FAQ
Are perpetual motion machines possible?
A perpetual motion machine is a hypothetical machine that can do work indefinitely without an energy source. This kind of machine is impossible, as it would violate the first or second law of thermodynamics.
Is the earth a perpetual motion machine?
Can we achieve perpetual motion?
Some people assert: "You can never achieve perpetual motion, for you can
never get rid of friction." That dogmatic assertion is easily refuted.
Look at the atom. The atom's electrons, if not disturbed, circulate
around the nucleus forever without energy loss.
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