Editing Transfer Of Energy (section)

== Demonstration ==

If you would like, begin by holding the tennis ball. Drop it from rest and explain that it won’t bounce any higher than the height that you dropped it from. You could do the same for the soccer ball.

Now, show how you can make it go higher. Begin by holding the soccer ball above the ground. The higher you hold it, the more energy it will have. A good height is about 3 feet. Now, either you or another person needs to hold the tennis ball above, close to, and centered on the soccer ball. Holding it about 1-2 inches above works well. Now, drop both balls at the same time. If you are working with another person, you might want to drop them on the count of three (or such). After falling and bouncing off the soccer ball, the tennis ball should go higher than where it was initially held. The soccer ball shouldn’t go any higher after its collision with the tennis ball.

Note: Try to keep the two as centered as possible throughout the entire demonstration. If the tennis ball hits the soccer ball at an angle, it will bounce at an angle rather than go straight up and could injure someone. Also, make sure that you DROP the balls from rest. Do NOT throw them or add velocity to their motion. If you do this, the ball(s) will have more initial energy than just the potential energy. This means that the ball would bounce higher than its initial height regardless of energy being transferred to it or not.