A potters wheel-a thick stone disk of radius 0.500m and mass 100kg is freely rot

Question

A potters wheel-a thick stone disk of radius 0.500m and mass 100kg is freely rotating at 50.0 rev/min. The potter can stop the wheel in 6.00s by pressing a wet rag against the rim and exerting a radially inward force of 70.0N. Find the effective coefficient of kinetic friction between wheel and rag. A potters wheel-a thick stone disk of radius 0.500m and mass 100kg is freely rotating at 50.0 rev/min. The potter can stop the wheel in 6.00s by pressing a wet rag against the rim and exerting a radially inward force of 70.0N. Find the effective coefficient of kinetic friction between wheel and rag.

Explanation / Answer

m = 100 kg, r = 0.5 m

w = 50 rpm = 5.236 rad/s

t = 6 sec

F = 70 N

uk = ?

w2 = w1 +alpha*t

alpha = 5.236/6

= 0.872 rad/s2

uk*N.r = mr^2/2 *alpha

uk = 0.31

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