Chaotic Motion of the Swinging Spring

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Your browser does not run this applet, for some reason.
Here is what it would look like:

The applet above shows a solution of this dynamical system for large energy. The motion is chaotic, not following any discernable regular pattern but varying in an unpredictable way. The horizontal cross-section should look something like this image:

[Chaos Pattern]

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Updated 23 March, 2001