What Causes Balls to Bounce?

Answer

Most balls bounce because they are filled with air. Basketballs and soccer balls depend on the internal air pressure for their bounciness. Solid balls, like super balls, bounce due to the release of compression, when they hit a non moving object. It is the same way the air filled ball bounces, without relying on air pressure. You can find more information here: http://www.howeverythingworks.org/bouncing_balls.html
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