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Spring Paradox

A mass hangs from two identical springs. First, the springs are attached in series by a short string between them. The springs are also connected in parallel by two peripheral strings that are initially slack. The center string is cut, changing the system from series to parallel. The mass does not move downwards, as one might have thought. Rather, the mass moves upwards because the spring constant of the system is increased.

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November 22, 2010 15:10
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