Solution: Consider the arrangement shown in the figure. A box of mass m = 5.00 kg is pushed up a slope of inclination angle θ = 25° by an applied force Fapp. The coefficients of static and kinetic friction between the box and the inclined plane are μs = 0.30 and μk = 0.20 respectively. Suppose the applied force has magnitude Fapp = F1 = 26.0 N. With the help of your diagram, determine the static frictional force acting on the box, assuming that the given applied force is not enough to start the box moving.

Consider the arrangement shown in the figure. A box of mass m = 5.00 kg is pushed up a slope of inclination angle θ = 25° by an applied force F_{app}. The coefficients of static and kinetic friction between the box and the inclined plane are μ_{s} = 0.30 and μ_{k} = 0.20 respectively. Suppose the applied force has magnitude F_{app} = F_{1} = 26.0 N. With the help of your diagram, determine the static frictional force acting on the box, assuming that the given applied force is not enough to start the box moving.