Jill is pushing a box across the floor. Which represents the upward force perpendicular to the floor?
Answer
A
cap f sub g
B
cap f sub cap p
C
cap f sub f
D
cap f sub cap n
Explanation
The force perpendicular to the floor is the normal force. Since the floor is horizontal, that force points upward, so the correct choice is F sub N, choice D.
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