Two boxes are on opposite ends of a plank that is 3.0 m long. The plank is supported in the middle by a fulcrum. The box on the left has a mass, m1, of 25 kg. The box on the right has a mass, m2, of 15 kg. Use the formulas below to determine how far the fulcrum must be positioned from the right side of the plank in order to balance the masses horizontally. (Hint: g=9.8m/s2)

Fg of m1=(m1)(g)
Fg of m2=(m2)(g)
Distance from the right= (Fg)m1 ( I ) ÷ (Fg)m1+(Fg)m2
a.
0.38 m
c.
1.1 m
b.
0.60 m
d.
1.9 m

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.

if they have a finite resultant

i will answer your question if you answer mine