a coin rests on a book. the book tilts until the coin just begins to move. the angle is 17 degrees. what is the coefficient of static friction?

1 answer

When the coin starts to slip, the friction force mu*cos17*M*g
is equal to the component of the weight down the incline, M*g sin 17.

Solve for mu, the coefficient of statice friction. The M (mass)and g (acceleration of gravity) terms will cancel out.