3A70.10 Wilberforce Pendulum

Concepts

Normal modes, coupled oscillations

Overview

When oscillating, the pendulum slowly shifts between torsional and vertical modes of oscillation. When stretched down, the spring applies a torque to the mass to help it unstretch. When compressed up, the spring applies a torque the other way. This leads to torsional motion. The converse happens when starting from torsional motion, leading back to vertical oscillations.

Details

Equipment

  • [1] Wilberforce pendulum

Script

  1. Start the pendulum oscillating vertically.
  2. Wait for it to change to torsional oscillations.

 

Additional Resources

References

  • PIRA 3A70.10 
  • Video Encyclopedia 9-08 
  • Sutton S-18
  • DHP Mx-11 
  • AJP 58(9), 833
  • TPT 21(4), 257

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.