Perpetual motion

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Robert Fludd's 1618 "water screw" perpetual motion machine from a 1660 woodcut. This device is widely credited as the first recorded attempt to describe such a device in order to produce useful work - driving millstones.^[1]

The term perpetual motion refers to a movement that goes on forever. More specifically, the term refers to a closed system (or a machine) that produces more energy than it consumes. Such a device or system would be against the law of conservation of energy, which states that energy can never be created or destroyed. The most conventional type of perpetual motion machine is a mechanical system which (supposedly) sustains motion despite losing energy to friction and air resistance, or while avoiding losing energy to friction and air resistance. According to the law of conservation of energy, such a device cannot exist.

[change] Notes

• Veljko Milković and Nebojša Simin (2001). Perpetuum mobile. Novi Sad (Serbia), Vrelo. 
• Schadewald, Robert J. (2008), Worlds of Their Own - A Brief History of Misguided Ideas: Creationism, Flat-Earthism, Energy Scams, and the Velikovsky Affair, Xlibris, ISBN 978-1-4636-0435-1

[change] Other websites

• Perpetuum Mobile Video.
• [1] Perpetual park video.
• Perpetuum Mobile Site.