1R40.30 - Balls Wanted Dead or Alive
Demonstrate elastic and inelastic collisions.
Provide both balls and a container. Two different sizes are available, 1 1/4" in diameter (Lecture Hall use) and 3/4" in diameter (export).
Two balls which have the same size, color, and density are dropped from the same height onto a hard surface (pick an arbitrary but repeatable height). One bounces to almost the same height while the other doesn't bounce.
The balls have very similar aesthetic properties: size, color, and density. They have one important difference: elasticity.
In an elastic collision, the kinetic energy is not converted into heat. In an inelastic collision, the kinetic energy is converted into heat.