Broom Finds Its Balance Point
Both fingers meet near the balance point.
Teaching & key ideas
What you do: Balance it on two fingers and slowly move fingers together.
What students see: Both fingers meet near the balance point.
Why it works: Friction changes as the support points move, guiding them toward the center of mass.
Question to ask: Where will your fingers meet?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Where will your fingers meet?