14 Mar, 2012
With toilet paper
PRESENTATION: If a system that may turn suffers the torque of an external field during a short time-lapse, the system does not change its rotation inertia. To make the system turn to start from the rest position it is necessary to apply an external force at a certain distance from the rotating axis during a minimum lapse of time.
- Angular Acceleration Without Torque?, Richard D. Kaufman, Phys. Teach. 50, 35 (2012)