A force is applied to a box that is initially at rest on an inclined surface. The incline is at an angle θ=20.0° above horizontal. The mass is m=36kg and the vertical force is Fapp= 48N. Between the box and the inclined surface the coefficient of static friction, μs=.240 and a coefficient of kinetic friction, μk=.150. Use this information to fine the normal force in this situation. I am confused on where to start. Do I have to use both friction coefficients?