3A75.XX Teacup Oscillations

Concepts

Normal modes, oscillations, sound

Overview

The teacup can be tapped with a pencil to excite two different normal modes, one each for when the handle is a node and an antinode. The ringing sound of the cup is different for each mode.

Details

Equipment

  • [1] Teacup
  • [1] Pencil
  • [1] Microphone (for large class)

Script

  1. Hold the cup in the palm of your hand, touching only the cup's bottom rim.
  2. Tap the cup on one of the marked lines. It should make a sound.
  3. Tap the cup at the other marked line. It should make a different sound.

 

Additional Resources

References

  • PIRA 3A75.XX

Disclaimer

  • Don't attempt this at home!

Last revised

  • 2018

Technicals

Related AV

Related demos

  • ?

 

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.