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Isti0503

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## Homework Statement

Estimate the rolling resistance force for a 75gram vehicle with axle friction coefficient of 0.2 if the wheel is 40mm diameter and the axle 2mm diameter.

I am having trouble with applying the axle friction coefficient. I could not find a similar problem online.

Basically we know that the smaller the radius of the circle the more tangential force is needed to produce the same torque (axle and the wheel). However, after I am not sure what to do with the axle friction coefficient.