Agaussian pulse of voltage v(t), described by v(t) = ae-a(t-to)2 is applied to the terminals of a very small parallel-plate capacitor with plate area s (each plate) and plate separation d. within the frequency range of the pulse, the dielectric inside the capacitor can be characterized by a frequency-dependent permittivity e-e-je"', where ω-2, and f is the operation frequency. the conductivity of the dielectric is oe neglecting fringe effects, determine an expression for the current i(t) fow- ing in the capacitor terminals.

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.