Slime Snaps Fast, Flows Slow
Same material stretches slowly but snaps under rapid pull.
Teaching & key ideas
What you do: Pull slowly, then yank quickly; let it creep over edge.
What students see: Same material stretches slowly but snaps under rapid pull.
Why it works: Polymer chains can rearrange over time but resist rapid deformation.
Question to ask: Why does speed change whether it stretches or breaks?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Why does speed change whether it stretches or breaks?