Thread Loop Opens with Soap
Loop snaps open into a larger shape.
Teaching & key ideas
What you do: Float loop, touch soap inside loop.
What students see: Loop snaps open into a larger shape.
Why it works: Soap lowers tension inside; higher tension outside pulls the loop outward.
Question to ask: What is pulling the thread?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: What is pulling the thread?