Question

jill is pushing a box across the floor. which represents the upward force perpendicular to the floor?
○ $f_p$
○ $f_f$
○ $f_n$
○ $f_g$

Explanation:

In physics, the normal force ($F_N$) is the upward - force perpendicular to the surface. $F_p$ usually represents a push or applied force, $F_f$ is the frictional force, and $F_g$ is the force of gravity (which acts downward).

Answer:

C. $F_N$