So today I went to the store and saw one of those click-clack ball sets on display, just like the one in the physics room. I stayed there a while just playing with them, testing out different heights to see the effects on the motion. The momentum of the ball being pulled up transfers to the balls that it hits. If we look at the law of conservation of momentum, the ball at the end of the line should be moving up at the same velocity that the first ball came in with. Because of this, the click clack balls can continue for a very long time. I wanted to buy them but they were a bit expensive since they looked really fancy. Oh well, maybe next year.
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