A 1.50 ×103 kg truck rounds an unbanked curve on the highway at a speed of 20.0 m/s. The maximum friction force between the surface of the road and all four of the tires is 8.00×103 N. a) Draw a diagram to model the problem.
b) Draw the FBD of the truck.
c) Calculate the minimum radius of curvature for the curve to prevent the truck from skidding off the road.

the answer is a 3.8cm

explanation:

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.