A Double Pendulum, a.k.a. a Chaotic Pendulum, is a simple, jointed pendulum used to study dynamic systems/chaos theory. It's also just a really cool widget that's fun to watch.
Not to be confused, BTW, with Steve Jackson's (of Steve Jackson Games fame) Chaos Machine, which is an entirely different mechanical animal.
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It would be neat to put an LED at the tip of the pendulum, turn off the lights, and film the path taken by the LED.
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That's one of the first things I thought of, too. I bet that's been done, probably frequently. A great way to study motion is a chaotic system.
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A second LED at the joint would be interesting too.
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Cliff Pickover gave it the name.
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