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Consider a car on a horizontal road...?
We can conclude that the downward gravitational pull of Earth on the car and the upward normal force of Earth on it are equal and opposite because:
A) the two forces form an action-reaction pair
B) The net force on the car is zero
C) the static friction between the car and the road is zero
D) all of the above
E) None of the above <<----ANS
I don't see why B) is not the answer. I guess because there could be more forces that just aren't described?
No, E is the correct answer according to the professor.
I can see myself A) can't be right, because both forces act on the car, while action-reaction pairs act on different objects.
2 Answers
- JullyWumLv 78 years agoFavorite Answer
A is not true because the gravitational attraction of the Earth on the car and the gravitational attraction of the car on the Earth are the action-reaction pair ( the two forces are equal because the car is in vertical equilibrium)
We are not told that the car has zero acceleration .. as you say, there could be other forces.
Answer (E) it is ..
- electron1Lv 78 years ago
Newton’s 3rd law: For every action, there is an equal reaction in the opposite direction. A is the correct answer.
