A yo-yo with moment of inertia I and mass m is hung using a light string over a frictionless pulley. A force F is applied to the other end of the string. The yoyo is allowed to unwind. As the yo-yo unwinds, the force needed to stop the pulley from rotating is _____ the weight mg.
A) less than
B) equal to
C) greater than
D) Depends how fast the yo-yo is unwinding.
E) Unable to tell.

Question

A yo-yo with moment of inertia I and mass m is hung using a light string over a frictionless pulley. A force F is applied to the other end of the string. The yoyo is allowed to unwind. As the yo-yo unwinds, the force needed to stop the pulley from rotating is _____ the weight mg.
A) less than 
B) equal to 
C) greater than 
D) Depends how fast the yo-yo is unwinding. 
E) Unable to tell.

Quizplus · Accepted Answer

The Answer of  A yo-yo with moment of inertia I and mass m is hung using a light string over a frictionless pulley. A force F is applied to the other end of the string. The yoyo is allowed to unwind. As the yo-yo unwinds, the force needed to stop the pulley from rotating is _____ the weight mg.
A) less than 
B) equal to 
C) greater than 
D) Depends how fast the yo-yo is unwinding. 
E) Unable to tell.

A Yo-Yo with Moment of Inertia I and Mass M