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Homework Statement
Two blocks of masses M and m are oriented as shown in the diagram. The block M moves on a surface with coefficient of kinetic friction μ_1, and the coefficient of static friction between two blocks is μ_2. What is the minimum force F which must be applied to M such that m remains stationary relative to M?
The diagram essentially looks like Utah rotated 90 degrees clockwise.
Homework Equations
∑F=ma
F_f = F_N * μ
The Attempt at a Solution
I drew force diagrams for both objects and summed up the forces, as is standard with these problems. My answer was:
g * (μ_1 * M + (m / μ_2))
The book tells you the correct answer and this is not it. I have triple checked my diagrams but I can't find my error.
Any help is greatly appreciated!