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 acroos a floor, it represents the upward motion and it is natural force 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

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

Ans:

The force which Jill is applying is the natural force. It is given by the agent here the agent is Jill. The normal perpendicular reactionary force or the reactionary force to be simple. So the upward force perpendicular to the floor is the normal reactionary force.