The Coefficient of Static Friction

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Place a coin at one edge of a textbook and slowly lift the book. When the coin just starts to slip down the incline, measure the angle (theta). Find Ff = m*g*sin(theta) and N = m*g*cos(theta).

Do I need to know the mass of the coin(m), gravity(g), and the angle(theta) the flate surface makes with the table?

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Solution Preview

Denote the coefficient of static friction by u. Denote the mass of the coin by m. Denote the supporting force and the friction force by N, F respectively. We can set up the following ...

Solution Summary

Denote the coefficient of static friction by u. Denote the mass of the coin by m. Denote the supporting force and the friction force by N, F respectively.

F - mgsin(theta) = 0
F = Nu

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