30 Nov '13, 6pm

Gravity-Powered Generator: Real or Fake?

It’s not friction. Friction is never why perpetual motion machines always fail. If a machine could produce more energy than it took in, even if it lost it to friction it would have created heat. So overall it would have increased the amount of energy (or mass-energy, but try keep the pedanticism to a minimum) in the Universe, which is impossible. But friction is just a conversion of energy, it doesn’t destroy it. Perpetual motion machines always fail due to misunderstandings on the part of the designer. They’re designed to run on slightly different principles than the ones the actual Universe runs on. Usually it’s a simple misunderstanding of mechanical forces, or of magnetism and the difference between force and energy. Annoyingly including the Old Faithful, “A magnet sticks to the side of a fridge for YEARS! If the magnet weighs 10 grams then that means etc etc!”, thinki...

Full article: http://hackaday.com/2013/11/30/gravity-powered-generator-...

Tweets

ono kad stručnjaci raspravljaju o... unicorns -.-

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