2D Friction--Finding the Force of Friction without Mu 1. The problem statement, all variables and given/known data A 1500kg car is parked on a 4-degree incline. The acceleration of gravity is 9.8 m/s2. Find the force of friction keeping the car from sliding down the incline. 2. Relevant equations FW=mg [Sigma]Fy=0, so Top=Bottom "Friction is Fun:" fs=musFN Since the degree of incline is 4 degrees, the angle with the "left" part of the x-axis on the free-body diagram and FW is 86 degrees. 3. The attempt at a solution After drawing a free-body diagram, I calculated Fw=(1500)(9.8)=14700N Next, I used Top=Bottom to calculate FN=14700sin(86)=14664.19154N Third, fs=musFN. This is where I got stuck. How can I solve for the force of friction without mu?