What is the minimum horizontal force F needed to make the box start moving in (Figure 1) ? The coefficients of kinetic and static friction between the box and the floor are 0.28 and 0.39, respectively.
The Attempt at a Solution
Im not sure that the N pointing downward is the normal force or not because I though normal force = 25kg* 9.81m/s2=245?
so would the minimum force be Fs= mu N......... (.39)(245)=96?
i just don't know what the 31 N signifies since it is pointing downward??? help please