Introduction Most balls will bounce when dropped to the oor, but not one will return to the height from which it was dropped. Since energy must be conserved, some energy is always lost as it is transformed into forms of energy that cannot be recovered as kinetic energy. Is there a way to make a ball bounce higher than it started? Where would the extra energy co me from? Materials High bounce ball,tennis ball, ping-pong ball, golf ball, meter stick Procedure 1. Test two balls at a time by c dropping each from a height of 0.1 meters. Measure and record the rebound height. 0 dropping the two together from a height of 0.1 meters with the lightest on top. Measure and record the rebound height. 0 dropping the two together from a height of 0.1 meters with the heaviest on top. Measure and record the rebound height. 2. Test the balls three at a time. Record the order they are in and drop them from a 0.1 meter height. Measure and record the rebound height. 1. Record your observations here. Be sure to include any numbers you recorded. 2. Explain your observations in terms of energy. What factor accounts for the difference in the results when the heavier ball is on the top or the bottom? 3. Explain your observations in terms of momentum. Why does the velocity increase in some cases and not in others? 4. How do the concepts used in this experiment help to explain how a ball can bounce and have a speed greater after the bounce than before the bounce? 5. What is the effect of mass in the results of this experiment