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Monday, August 5, 2013

Magnetic Perpetuum Mobile



Is this a Magnetic Perpetuum Mobile?




The law of conservation of energy forbids perpetual motion. On the other hand, the small magnets in this image seem to be attracted / repelled by the large magnet, producing motion. As a child, I imagined this machine, and for a while I was perplexed, since on the one hand I knew it can't move forever, because it would break conservation of energy, but on the other hand, it is not that obvious what exactly happens that makes it stop.

4 comments:

  1. Very good paradox but the explanation is too concise.

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  2. Thanks. It is indeed concise. I posted a slightly longer explanation at Physics Stack Exchange.

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  3. I would be beneficial for most of the people.
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    ReplyDelete