# A potter's wheel - a thick stone disk of radius 0.500 m and mass 120 kg - is freely rotating at...

## Question:

A potter's wheel - a thick stone disk of radius 0.500 m and mass 120 kg - is freely rotating at 50.0 rev/min. The potter can stop the wheel in 6.00 s by pressing a wet rag against the rim and exerting a radially inward force of 66.0 N. Find the effective coefficient of kinetic friction between the wheel and rag.

## Potter's wheel

A potter's wheel is often used by a potter to shape mud into various artistic forms. It consists of a rotating disk on which mud is put and allowed to rotate and then a wet rug is pressed against the mud to create a shape and finally stop the rotating disk. The frictional force between the wet rug and the wheel helps the wheel to stop rotating.

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Given

• Mass of the potter's wheel = m=100 kg
• Radius of the wheel = R=0.5 m
• Normal force on the wheel ={eq}F_n=66 N {/eq}
• Initital angular velocity =...

Friction: Definition and Types

from

Chapter 7 / Lesson 5
39K

You experience friction all the time, and you should be glad you do! Friction helps keep stationary objects in place as well as slow moving objects down as they slide across a surface. This lesson identifies what friction is and explains the two ways we find this force on earth.