Register to reply

Rotational Equilibrium and Rotational Dynamics problem

by BBallman_08
Tags: dynamics, equilibrium, rotational
Share this thread:
Nov5-07, 09:17 PM
P: 27
The Question:

A potter's wheel having a radius of 0.50 m and a moment of inertia of 12 kg m^2 is rotating freely at 50 rev/min. The potter can stop the wheel in 6.0 sec by pressing a wet rag against the rim and exerting a radially inward force of 70 N. Find the effective coefficient of kinetic friction between the wheel and the rag.

What I know:

I know with the info given, I must use the angular version of newton's 2nd law.

Sum (Torque) = I(Moment of Inertia) Alpha (Angular Acceleration).

But I am unsure how this even relates to the coeff. of kinetic friction.

Any help???
Thanks In Advance
Phys.Org News Partner Science news on
Suddenly, the sun is eerily quiet: Where did the sunspots go?
'Moral victories' might spare you from losing again
Mammoth and mastodon behavior was less roam, more stay at home
Doc Al
Nov6-07, 05:38 AM
Doc Al's Avatar
P: 41,292
The friction force is the tangential force producing the torque that stops the wheel. How does kinetic friction relate to the normal force, which is the force with which the potter pushes against the rim?

Register to reply

Related Discussions
Rotational Equilibrium and Dynamics Physics Learning Materials 2
Rotational Equilibrium and Rotational Dynamics Introductory Physics Homework 1
Rotational Equilibrium and Dynamics Problem Introductory Physics Homework 7
Rotational Equilibrium and Dynamics - Introductory Physics Homework 2
Rotational Equilibrium and Dynamics Introductory Physics Homework 6