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300tube TED-Ed   5 June, 2017

download youtube mp4 : Why don't perpetual motion machines ever work? - Netta Schramm

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Perpetual motion machines — devices that can do work indefinitely without any external energy source — have captured many inventors’ imaginations because they could totally transform our relationship with energy. There’s just one problem: they don’t work. Why not? Netta Schramm describes the pitfalls of perpetual motion machines. 

Lesson by Netta Schramm, animation by TED-Ed.