Originally shared by Ralph Roberts
The Quest for Perpetual Motion
DarkRoastedBlend: "Perpetual motion is a term used to describe a machine that can operate indefinitely. It is also sometimes used to define a device that produces more energy than it uses, no matter how long it is able to operate. Most scientists and scholars agree that perpetual motion violates either the first or second law of thermodynamics or in fact breaks both of them. Some devices which don’t break these laws but get their energy from an obscure source have been called perpetual motion machines, but really aren’t. ..."
full article, lots of illustrations: http://www.darkroastedblend.com/2011/09/perpertuum-mobile-quest-for-perpetual.html
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