The Mind-Bending Physics of a Tennis Ball's Spin

How tennis players create spin is about as complicated a physics question you can set about solving without invoking subatomic particles.

Commusings: Tennis, Anyone? by Jeff Krasno

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The Mind-Bending Physics of a Tennis Ball's Spin

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Precision machined globe. It is made of aerospace grade aluminum with a spiral groove next to the entire surface. Each globe has a rotating metal base

Desktop Motion Toys, Full Body Optical Illusion Fidget Spinner Ball, Creates a Mind-Bending Optical Illusion of Continuously Flowing Top Adult&Kids