1. The problem statement, all variables and given/known data A 5000 kg truck is parked on a 14 degree slope. How big is the friction force on the truck? 2. Relevant equations friction = coefficient of friction X normal force 3. The attempt at a solution I tried breaking the weight into components. I used 1.00 as the coefficient of friction (given in a table in the book...rubber on concrete). I got 60916.27 N, which of course was wrong.