A 65 kg woman is inside an elevator. (A) Calculate her apparent weight (normal force) in Newtons if the elevator moves at constant speed of 10 m/s downward. Be sure to keep 3 significant digits.

W = 637 N

Explanation:

For this exercise we will use Newton's second law

         F -W = m a

where F is the force, m the mass and the acceleration

in this case the force is the weight of the body and as the elevator goes at constant speed the acceleration is zero

         F = W

         a = 0

          F = W

          W = m g

          W = 65 9.8

          W = 637 N

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.