Falling Chimney Paradox
Different points accelerate differently; model may bend/break in segmented version.
Teaching & key ideas
What you do: Tip long ruler from vertical and watch top/sections.
What students see: Different points accelerate differently; model may bend/break in segmented version.
Why it works: Rotational motion means farther points need greater tangential acceleration.
Question to ask: Why doesn't every part fall the same way?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why doesn't every part fall the same way?