1. The problem statement, all variables and given/known data http://img59.imageshack.us/img59/493/capturemml.png [Broken] 3. The attempt at a solution Here is my attempt. I assumed that both the man and the box would slide down the incline. (The box is the left diagram and the man is on the right) http://img35.imageshack.us/img35/7628/photorxq.jpg [Broken] The acceleration I get from this attempt tells me that they accelerate the other way. So do I have to change the directions of the friction forces to find the answer? I am not sure what to do next. Also how do I use the coefficient of static friction in this question?