1N30.60 Double Ball Drop
Concepts
Momentum and energy transfer through inelastic collisions
Overview
The basketball and tennis ball are dropped so that they are touching with the tennis ball on top. When they hit the floor, the tennis ball flies off with greatly increased energy and momentum.
Details
Equipment
- [1] Basketball
- [1] Tennis ball
Important Notes
- This demo works best with hard surfaces. Dropping the balls on carpet dampens the bounce.
Script
- Hold the tennis ball and basketball so that they are touching, with the tennis ball on top.
- Drop the balls with the basketball on the bottom. The tennis ball will fly off with greatly increased momentum and energy.
Additional Resources
References
- PIRA 1N30.60
Disclaimer
- Don't attempt this at home!
Last revised
- 2023
Technicals
- Original construction: purchased.
- For basketball inflation, a good rule of thumb is that if you drop the ball from eye-height, the ball should bounce back to waist-height.
- The usual bike pump for inflating the basketball is a little awkward to use. The needle for inflating the ball lets air through slowly. Leave the needle in the ball and give the foot pedal a couple of pumps, then let the air flow into the ball for a few seconds, then repeat as needed. The pressure gauge on the pump will show decreasing pressure as air goes into the ball.
Related AV
Related demos
- Collision Balls (Ninja Balls)
If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.