Fixed vs Movable Pulley
Movable setup requires less pulling force but more rope.
Teaching & key ideas
What you do: Lift same load with fixed pulley and movable pulley.
What students see: Movable setup requires less pulling force but more rope.
Why it works: Mechanical advantage trades distance for force.
Question to ask: Where did the 'saved force' go?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Where did the 'saved force' go?