An aluminum block weighing 28 kg initially at 140°c is brought into contact with a block of iron weighing 36 kg at 60°c in an insulated enclosure. determine the final equilibrium temperature and the total entropy change for this process. the specific heat of aluminum at 400 k is cp 0.949 kj/kg-k. the specific heat of iron at room temperature is cp 0.45 kj/kg-k

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.