Slime Snaps Fast, Flows Slow

1. Slime Snaps Fast, Flows Slow Materials: Prepared school-safe slime 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. Question: Why does speed change whether it stretches or breaks? 2. Brownian Motion Under a Microscope Materials: Microscope; prepared pollen/microspheres in water What you do: Observe tiny particles at high magnification. What students see: Particles jitter randomly even when liquid seems still. Question: What is hitting the particles if we can't see it? 3. Paper Arch Supports Weight Materials: Index cards; two blocks; coins or small weights What you do: Bridge a gap with flat paper, then with folded/arched paper. What students see: The shaped paper holds much more weight. Question: How did the same paper become stronger?

Predict → observe three demonstrations → compare what changed → choose independent activity station → cleanup/share. Guiding questions: Question: Why does speed change whether it stretches or breaks? Question: What is hitting the particles if we can't see it? Question: How did the same paper become stronger?