If you lift the front wheel of a poorly maintained bicycle off the ground and then...
If you lift the front wheel of a poorly maintained bicycle off the ground and then start it spinning at 0.66 rev/s, friction in the bearings causes the wheel to stop in just 13 s.
If the moment of inertia of the wheel about its axle is 0.33 kg⋅m2, what is the magnitude of the frictional torque?
Homework Answers
Change in angular speed, w = 0.66 rev/sec = 0.66 x 2 pi = 4.15 rad/sec
Angular acceleration, alpha = 4.15/13 = 0.32 rad/sec^2
Torque, T = I alpha
T = 0.33 x 0.32 = 0.11 Nm
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