1. The problem statement, all variables and given/known data Resolve the force F into a) a part perpendicular to AB and b) a part parallel to BC 2. Relevant equations a dot b = ab*cos(θ) 3. The attempt at a solution I attached my attempt in the .pdf file. For some reason it is wrong. I don't understand how my reasoning is incorrect. The orange square in the picture is a supposed to be a wooden box in the problem, so that detail is not important to the problem.