The Spool Paradox #science #experiment #physicsninja

3-Second Blueprint (English)

1. Pulling a resting spool's lower rope at a shallow angle creates rotational torque that rolls it toward you.
2. Pulling the rope at a steeper angle reverses the torque direction so the spool rolls away instead.
3. At the exact critical angle between both regimes, rolling stops completely and the spool slides across the surface.