Hi! Welcome to the Flying Circus of Physics. I’m Jearl Walker, one of the physics professors
here at Cleveland State University, and today we’re in the Rec Center to show you a little bit of physics of bouncing balls. I’ve got a soccer ball. I’ve got a hard ball, a baseball. I’m going to drop this soccer ball. It bounces reasonably well. I’m going to drop the hard ball. Ah, hardly bounces at all. But now I’m going to do something really different. I’m going to put the hard ball on top of the soccer ball and drop them together. And the idea is this: The soccer ball is going to hit first, of course, and come back up and collide with the hardball. This soccer ball is going to have some momentum that’s the product of mass and speed. It’s going to transfer that momentum to the hard ball, but this has small mass. So when it picks up that momentum it’s going to have a large speed
and should go surprisingly high. Let’s try it. Thanks for watching! Hope to see again
here at the Flying Circus of Physics. Just remember: Physics is everywhere. Especially in a sports gym.