One rubber ball will bounce very high; the other rubber ball will hit the ground and not bounce. They look the same, but they are different. Explore polymer chemistry with the Happy/Sad Balls. One Happy and one Sad Ball are included in each package.
The Happy/Sad balls are polymer balls that are ideal for collision studies. The Happy ball stores very little energy in collisions and bounces well. The Sad ball stores a lot of energy and doesn’t bounce. Besides the obvious collision activities, try the following: • Place them in water. Which floats? Which sinks? Mass them and calculate their densities. • Freeze the balls for at least an hour and then bounce them before they warm up. (Amazing reversal.) • Place them in boiling water and then bounce them. • Which one is most efficient in knocking over objects? • Which polymer would you want in your tennis shoes? car bumpers? rubber hammer?