Chain Fountain
The chain rises above the cup before falling.
Teaching & key ideas
What you do: Pull a short chain end over the rim and let it fall.
What students see: The chain rises above the cup before falling.
Why it works: Accelerating links create an upward reaction plus momentum transfer.
Question to ask: Why does the chain go up before gravity pulls it down?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why does the chain go up before gravity pulls it down?