![]() ![]() 333, indicating one hit out of every three times at the plate, is achieved only by the star hitters of the game.Ī fastball covers the distance from the mound to the plate in less than half a second, requiring lightning reflexes and judgment from the batter to even make contact. In this intense struggle, the pitcher usually wins. Since the sad ball stores its energy far more than the happy ball, that energy is not being transferred in the collision, which is why it appears to be an inelastic collision.The central drama in the game of baseball is the confrontation between the pitcher and the batter. The happy ball is, of course, the one that bounced and then I will explain what hysteresis is and how that affects the amount of energy stored in each ball. I will then ask the audience which ball is the “happy” ball and which is the “sad” ball based on what they saw happened. The happy ball will bounce significantly higher than the sad ball. After everyone is given a chance to compare/contrast, I’ll drop both at the same height and time, making sure everyone can see. Usually the student would have to squeeze pretty hard to have the rubber give in their hand. I will then pass them around so each student can try to feel for any difference. They look exactly the same so most, if not all, will say no. I like to start by showing then asking the students if there’s any difference in the balls. ![]() This particular demo is a bit more abstract as the students will be missing the internal aspect with hysteresis, but you can explain this more in depth after showing the demo. ![]() I like to do the large metal ball collision after to demonstrate a different form of energy conservation (via heat and sound). Happy/Sad balls can come after demonstrating the large/small balls collision so the students have seen how energy can transfer and how it remains conserved. ![]()
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