Answered: I+mR, R2 f = I+mR,2 (b) Determine the…

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I+mR, R2 f = I+mR,2 (b) Determine the direction of the force of friction. Figure P10.45 Ri

Physics for Scientists and Engineers with Modern Physics

10th Edition

ISBN:9781337553292

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter7: Energy Of A System

Section: Chapter Questions

Problem 20P: Review. The graph in Figure P7.20 specifies a functional relationship between the two variables u...

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Concept explainers

Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.

Question

A spool of thread consists of a cylinder of radius R1 with end caps of radius R2 as depicted in the end view shown in Figure P10.91. The mass of the spool, including the thread, is m, and its moment of inertia about an axis through its center is I. The spool is placed on a rough, horizontal surface so that it rolls without slipping when a force acting to the right is applied to the free end of the thread. (a) Show that the magnitude of the friction force exerted by the surface on the spool is given by

I+mR, R2
f =
I+mR,2
(b) Determine the direction of the force of friction.
Figure P10.45
Ri

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