Can you find kinetic friction
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Can you find kinetic friction

[From: ] [author: ] [Date: 11-04-22] [Hit: ]
0kgis rotating at 850rpm . You press an ax against the rim with a normal force of 160N(see the figure below), and the grindstone comes to rest in 8.00sec . Find the coefficient of kinetic friction between the ax and the grindstone.0.......
A grindstone in the shape of a solid disk with diameter 0.520m and a mass of 50.0kg is rotating at 850rpm . You press an ax against the rim with a normal force of 160N (see the figure below), and the grindstone comes to rest in 8.00sec . Find the coefficient of kinetic friction between the ax and the grindstone. (negligible friction in the bearings)

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inertia = 1/2mr^2

0.5 x 50 x 0.26^2 = 1.69 kg.m^2

rotational KE = 1/2Iω^2

850 rpm / 9.55 = 89 rad/s

0.5 x 1.69 x 89^2 = 6693.24 J

1/2Iω^2 = work done by torque

work done by torque = torque x distance in radians

distance in radians = (89 + 0)/2 x 8 = 356

6693.24/356 = torque = 18.8 N.m

torque of ax = 160 x 0.26 = 41.6

18.8/41.6 = coefficient of kinetic friction = 0.452

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You got me... check it below. http://obuyo.info/416968/bearings%2f
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