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**[SOLVED] Rolling object and friction**

## Homework Statement

I want to find an expression for the coefficient of friction when this object starts to skid when we pull it with a force F

http://www.badongo.com/pic/3639015

## The Attempt at a Solution

F

_{f}= (mju)*Mg

I found that I can put this into Newton's 2. law for rotation and solve for alpha = 0. But why can't I put it into newton's 2. law for linear motion and solve for alpha = 0 (a = (alpha)*R)?

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