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
  • [1] Lab jack

Important Notes

  • Make sure that when transporting the demo, the lab jack prevents the pendulum from swinging wildly.

Script

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

 

Additional Resources

References

Disclaimer

  • Don't attempt this at home!

Last revised

  • 2020

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.