Below are six crates at rest on level surfaces. The crates have different masses and the frictional coefficients [the first value is the static friction and the second is the kinetic friction] between the crates and the surfaces differ. The same external force is applied to each crate, but none of the crates move. Box 1= 600kg (Static friction-0.8)(Kinectic friction-0.5) Box 2=750kg (Static friction-0.6)(Kinetic Friction-0.5 Box 3=1500kg(Static friction-0.3)(Kinetic friction-0.1) Box 4=500kg(Static Friction-0,6)(Kinectic friction-0,3) Box 5=750kg(Static Friction-0.4)(Kinectic Friction-0.3) Box 6=250kg(Static Friction-0.2)(Kinetic Friction-0.1) I need to rank the crates on the basis of the frictional force acting on them The equation I would use here is the static friction equation (Static Friction is less than or equal to the miu times the normal force) Since the boxes arent moving I would just multiply the mass of the box times the coefficient of the static friction (For example the first box would be 600x0.8 and then rank those numbers i get from greatest to least correct? However I tried this and it doesnt like my answer. Am i doing something incorrect?