Plate-Spinning
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Image © Justinen Creative from GoodSalt.com

Do you remember that old circus trick? The performer would have about five sticks standing up straight and he’d put a plate on the end of each of the sticks and start it spinning so that the centrifugal force would hold the plate up and on the end of the stick. As long as the plate kept spinning at a reasonable speed, the plate stayed up, but if it slowed down too much, it […]