The Wikipedia article on perpetual motion does a very nice job of explaining this in more detail. perpetual synonyms, perpetual pronunciation, perpetual translation, English dictionary definition of perpetual. In reality, all physical systems are subject to dissipative forces, so it is impossible to construct a machine that maintains its original motion without an external source of energy. Therefore this particular meaning of perpetual motion is impossible. an ingenious article, device, or contrivance. a fanciful or foolish idea whim: She had a notion to swim in the winter. conception or idea: his notion of democracy. an opinion, view, or belief: Thats his notion, not mine. A driving force adds energy to the system, whereas dissipative forces take energy away, so if there are dissipative forces but no driving forces, the system's energy has to decrease over time, and thus it can't keep moving in its original pattern. a general understanding vague or imperfect conception or idea of something: a notion of how something should be done. blooming almost continuously throughout the season or the year. What a physicist means by perpetual motion is a system that is able to maintain its original state of motion, without being subject to a driving force, in the presence of dissipative forces like friction or bremsstrahlung radiation. continuing or continued without intermission or interruption ceaseless: a perpetual stream of visitors all day. The laws of physics have no problem with the idea that something can be in motion perpetually for example, a rock moving at constant velocity through an otherwise empty universe. perpetual motion, the action of a device that, once set in motion, would continue in motion forever, with no additional energy required to maintain it. The catch is that in physics, perpetual motion doesn't mean what you might literally interpret it to mean - that is, it doesn't just refer to something that is able to keep moving forever. No, neither of the systems you've brought up is an example of what physicists mean when they say "perpetual motion." perpetual motion motion that continues indefinitely without any external source of energy impossible in practice because of friction problem solving the. In Section 2 we introduce the notion of strict A-model and discuss restricted A-calculi such as the I KN-calculus.
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