In the diagram the person on the left has been replaced with a block fastened rigidly to the table the person on the right has stretched the spring scales until the one on the right reads 10n and the cart is at rest, how many newtons are on the left

it breaks and dirupture other materials and other sencews from the bottom

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.