Friction -- signs of the forces correct? 1. The problem statement, all variables and given/known data I have a question about part c). I've attached the picture of the problem. It's a typical friction problem on an inclined plane, and I get the wrong answer so there's something about my setup that's wrong. 2. Relevant equations 3. The attempt at a solution I show my work in an attachment. I get P=127, but the answer is P=80. What am I doing wrong. How are the direction of my vectors? Thanks for the help.