Well it's volleyball season now. It is quite different from basketball but at least I get to pound volleyballs into opponents faces. That is always fun. Actually that's what I want to talk about. The force at which a ball bounces off a person's face is greater than if a ball just hit someone's face and fell to the ground. If I were to bounce a ball off a person's face the mass of the ball times the speed of the ball hit plus the speed of the ball after it bounces is the momentum. A ball that just stops would only be the speed the ball was hit plus zero because the ball came to a stop. The ball that bounces has a greater change in momentum which also equates to a larger impulse. So if you see a ball bounce off someone's face you know that hurt way more than if a guy stopped a ball with his face.
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