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

fp

ff

fn

fg

The right option is; FN

Normal Force (FN) represents the upward force perpendicular to the floor

Normal Force (FN) is a support force applied on an object when the object is in contact with another stable object. Normal Force is the upward force on an object at rest and it is usually perpendicular to the surface. From the question given, Jill is pushing a box across the floor. The floor is exerting an upward force (normal force) upon the box in order to support the weight of the box.

the answer is c because it is most logical.