A block of mass 0.80 kg rests on the inclined surface of a wedge of mass 2.0 kg. The wedge is acted on by a horizontal force F and slides on a frictionless surface.
If the coefficient of static friction between the wedge and the block is µs = 0.40, and the angle of the incline is 35°, find the maximum and minimum values of F for which the block does not slip.
The Attempt at a Solution
Finding the minimum seems to be pretty straightforward to me. What I have is
ma=mg sin(35) - mg cos(35) μ
Finding the acceleration there, I plug it in for the wedge (as they should be the same if the block is staying put) into ma=F
That gets me the value my homework is asking for, but I have little idea of what to do to find the maximum force.