1. The problem statement, all variables and given/known data what is the max angle the plane can be at so that the crate stays at rest. static friction coefficient: 0.60 mass of crate: 10kg max angle of plane: ? my free body diagram http://img.photobucket.com/albums/v217/tylerc13/physprob.jpg my approach: I set it up so that the forces of +mg and -mgUk would = 0. My train of thought was that if they canceled each other out there would be no movement... guess not. edit: i just realized im not incorporating the frictional coefficient into this, and i might have it a bit backwards. would my positive (downward) force be mg*sin theta and the my negative (upward resistance from friction) force be N*Uk ?