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. Support Physics Girl videos → https://www.patreon.com/physicsgirl ‪http://physicsgirl.org/ ‪http://twitter.com/thephysisgirl ‪http://facebook.com/thephysic

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Take a look at this invention called the Perpetual Motion Marble Machine, and watch how it works. Have you seen it before, do you think there’s something wrong with what you’re seeing? Or do you think it's working like it should. Now take a look under the base of this crafty little invention, does this make some of you feel better? Or were you tricked into thinking that this invention really works, and the little steel ball would continue on its loop forever. There’s a reason why there’s a batte