Bimetal Strip Bends with Heat
Strip bends by itself.
Teaching & key ideas
What you do: Warm strip gently, then cool it.
What students see: Strip bends by itself.
Why it works: Two bonded metals expand by different amounts.
Question to ask: Why does one strip curve instead of just getting longer?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why does one strip curve instead of just getting longer?