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
-  Lab jack
- Make sure that when transporting the demo, the lab jack prevents the pendulum from swinging wildly.
- 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
- U. Köpf, "Wilberforce's pendulum revisited," AJP 58, 833 (1990)
- J. Williams and R. Keil, "A Wilberforce Pendulum," TPT 21, 257 (1983).
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- 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.