Assume it to be approximately an annular ring with an inner radius of r1 = 0.280 m and an outer radius of r2 = 0.440 m. the motorcycle is on its center stand, so that the wheel can spin freely.(a)if the drive chain exerts a force of 2450 n at a radius of 5.00 cm, what is the angular acceleration (in rad/s2) of the wheel?

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.