Rotational Dynamics Problem 8.6.3

 

Description

A turntable (a flat disk) of mass 5.0-kg is rotating at a constant speed when your finger makes contact with the outer edge, as shown in the animation (position of a point on the outer edge of the turntable is shown in meters and time is shown in seconds). Friction between your finger and the turntable causes the turntable to stop. 

Question

What is the average torque on the turntable caused by the frictional force? Start

Answer

-1.35 Nm.

Reference

See Giancoli-PA: 8-5, Giancoli-SE: 10-6.

Credits

Physlet problem authored by Aaron Titus and modified by Mario Belloni.

2000 by Prentice-Hall, Inc. A Pearson Company