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Every physics department needs a double pendulum, so here's how I built ours. The big improvement is that the bottom pendulum can be locked in place. This turns ...
This aluminum bar is half of the top pendulum. Another similar bar forms the second half. The ball bearings are 3/8" ID x 7/8" OD x 7/32" wide ...
This is the pivot for the bottom pendulum. The length is the same as the width of the top pendulum spacing block.
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