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Perpetual motion

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Why is perpetual motion impossible on earth?

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Solution Summary

Perpetual motion is explained in layman's terms.

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Perpetual motion on earth is impossible because of friction.
The concept breaks the basic laws of thermodynamics. Many designs have been purported to do this but all have proved bogus.
The kicker comes from the second law of thermodynamics which states:

'In all energy ...

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