Euler's Disk Wobble
The wobble gets faster just before it stops.
Teaching & key ideas
What you do: Spin disk/coin and let it settle.
What students see: The wobble gets faster just before it stops.
Why it works: Friction removes energy while the geometry of the wobble changes.
Question to ask: Why does the wobble speed up while the disk is losing energy?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why does the wobble speed up while the disk is losing energy?