Question: Bob is applying a horizontal force to a box across a level floor. The box can slide across the floor without friction. Identify the forces acting on the object of interest. From the list below, select the forces that act on the box. A. gravitational force acting on the box (box's weight) B. force of the floor on the box (normal force) C. force of the box on the floor D. force of Bob on the box E. force of the box pushing on Bob I know that A, B, and C are true, but I'm confused of D and E. In free body diagram, do you also include Newton's 3rd law, which is D and E? Thank you.