3A70.10 Wilberforce Pendulum
Normal modes, coupled oscillations
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.
-  Wilberforce pendulum
- Start the pendulum oscillating vertically.
- Wait for it to change to torsional oscillations.
- PIRA 3A70.10
- Video Encyclopedia 9-08
- Sutton S-18
- DHP Mx-11
- AJP 58(9), 833
- TPT 21(4), 257
- Don't attempt this at home!
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.