When an object rests on a surface, there is always a force perpendicular to the surface; we call this the normal force, denoted by n_vec.

When an object rests on a surface, there is always a force perpendicular to the surface; we call this the normal force, denoted by n_vec. The two questions to the right will explore the normal forceA man attempts to pick up his suitcase of weight w_s by pulling straight up on the handle. (Part A figure) However, he is unable to lift the suitcase from the floor. Which statement about the magnitude of the normal force n acting on the suitcase is true during the time that the man pulls upward on the suitcase?