Chapter 4
Newton's Three Laws

Solution 16

We need to use the idea that since the coin is just about to slide it has reached its maximum static friction,

Then solving for :

Now we need to find all of the forces, then use Newton's Second Law. Since, the coin is not moving all of the forces in the direction of motion are zero.

For the forces:

For the parallel forces:

Now for the perpendicular direction:

Then we put the above equations into the equation:

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