Question

Jill is pushing a box across the floor. Which represents the upward force perpendicular to the floor?

Answer 1

When Jill is pushing a box across a floor, it represents the upward motion and it is natural force is applied.

So it is represented as FN and normal force takes place in considering the force perpendicular to the floor.

It seems to support that forced applied on an object when the object is in contact with other.

Answer 2

The normal reaction force represents the upward force perpendicular to the floor.

Reason for the answer: The normal force prevents the object from falling through the surface it rests on. On an incline plane, part of the object’s weight pushes against the surface, and part of it pushes the object; the normal force is the equal and opposite force of the surface pushing against the object. the