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[Eric Archer] constructed an analog computer to model the physics of a bouncing ball. The core is a TL074 opamp that does all the integral math. He had no trouble finding descriptions of analog ...

Here's how to get more bounce from a normal tennis ball - buddy it up with a heavier ball for twice the impact. Hold a ball in each hand and decide which ball weighs more (has greater mass).

Pressurised air inside the rubber core makes the ball bounce. Balls which haven't got enough pressure inside make a thud when they hit the floor. These are called dead balls. For the first Wimbledon ...