Ok, I've been having some real trouble with this problem. Either I’m missing some key piece of reasoning or it’s harder then it seems. ”If a block of mass m is pressed against a vertical surface by a constant force Fh, what are the maximum and minimum angels that that force can be applied and still have the block remain stationary? Express in terms of m, g, theta, and mu.” Now I assume that what is needed is to equate the maximum static friction force to the total force applied parallel to the surface, but I’m having trouble finding an equation that will give me my answer. Any tips or pointers would be greatly appreciated.