newtons third law quick check
when inflating a balloon, which of the following represents an equal but opposite force acting on the balloon? (1 point)
○ the air entering the balloon
○ the expansion of the balloon
○ releasing the balloon
○ tying the balloon

Question

Accepted Answer

# Brief Explanations:
Newton's Third Law states that for every action, there is an equal and opposite reaction. When inflating a balloon, the air entering the balloon (action force) pushes against the inside of the balloon, and the balloon exerts an equal and opposite force on the air (but the question is about the force acting on the balloon). Wait, actually, when air is pumped into the balloon, the air exerts a force on the balloon (causing it to expand), and the balloon exerts an equal and opposite force on the air. But among the options, the air entering the balloon: when the air is entering, the balloon pushes back on the air (reaction), but the force acting on the balloon from the air is the action's reaction? Wait, let's re - evaluate. The action is the air pushing into the balloon (the force of the air on the balloon), and the reaction is the balloon pushing back on the air. But the question is which represents the equal but opposite force acting on the balloon. Wait, maybe I got it wrong. Let's think again. When you inflate the balloon, you are forcing air into it. The air molecules collide with the inside of the balloon, exerting a force (action) on the balloon. According to Newton's Third Law, the balloon exerts an equal and opposite force on the air. But the options: "the air entering the balloon" – the force of the air entering is the action, and the balloon's reaction force on the air is opposite, but the force acting on the balloon from the air is the action, and the opposite force acting on the balloon? Wait, no. Wait, maybe the correct option is "the air entering the balloon" – no, wait. Wait, when you inflate the balloon, the air inside pushes out (but during inflation, you are adding air). Wait, maybe the answer is "the air entering the balloon" because the balloon exerts a force on the air (opposite) and the air exerts a force on the balloon (action). Wait, the question is "which of the following represents an equal but opposite force acting on the balloon". So the action is the force of the air on the balloon (when inflating, you push air into the balloon, so the air pushes the balloon from the inside, causing it to expand). The reaction force would be the balloon pushing back on the air. But the options: "the air entering the balloon" – the force of the air entering is the action, and the balloon's reaction to that force (the force the balloon exerts on the air) is opposite, but the force acting on the balloon is the air's force. Wait, maybe I'm overcomplicating. Let's analyze each option:

- "the air entering the balloon": When air enters the balloon, the balloon exerts a force on the air (opposite and equal) as per Newton's Third Law. But the force acting on the balloon from the air is the action, and the force acting on the balloon's opposite would be... Wait, no. Wait, Newton's Third Law is about action - reaction pairs, where the action and reaction act on different objects. So if the air exerts a force on the balloon (action), the reaction is the balloon exerting a force on the air. But the question is about the force acting on the balloon. Wait, maybe the correct option is "the air entering the balloon" because the force of the air entering (air pushing balloon) and the balloon pushing air (reaction) – but the force acting on the balloon is the air's force, and the opposite force (on the balloon) would be... No, maybe I made a mistake. Let's check the other options:

- "the expansion of the balloon": Expansion is a result of force, not a force itself.

- "releasing the balloon": Releasing is an action, not a force acting on the balloon during inflation.

- "tying the balloon": Tying is an action, not a force related to the inflation's action - reaction.

So the correct option should be "the air entering the balloon" because when air enters the balloon (the action force of air on balloon), the balloon exerts an equal and opposite force on the air, but the force acting on the balloon (from the air) has an equal and opposite force (the balloon's force on air), but the question is about the force acting on the balloon. Wait, maybe the question is phrased as: when inflating (so the action is the air being pushed into the balloon, the balloon is being pushed by the air), the equal and opposite force acting on the balloon would be... Wait, no, the action - reaction pair is between the air and the balloon. The air pushes the balloon (action), the balloon pushes the air (reaction). So the force acting on the balloon (from air) and the force acting on the air (from balloon) are equal and opposite. So the force acting on the balloon (from air) has an equal and opposite force (on air), but the question is which represents the equal but opposite force acting on the balloon. Wait, maybe the question is a bit misphrased, but among the options, "the air entering the balloon" is the source of the force on the balloon, and the reaction force (on the air) is opposite, but the force on the balloon's opposite would be... No, I think the correct answer is "the air entering the balloon" because the force of the air entering (air on balloon) and the balloon's force on air are equal and opposite, and the question is asking for the force acting on the balloon's equal and opposite, but maybe the intended answer is that the air entering the balloon exerts a force on the balloon, and the balloon exerts an equal and opposite force on the air, but the option "the air entering the balloon" is the action force, and the reaction force (on the balloon) – no, I'm confused. Wait, let's recall Newton's Third Law: $F_{AB}=-F_{BA}$, where $F_{AB}$ is the force of A on B, and $F_{BA}$ is the force of B on A. So if A is air and B is balloon, $F_{air - balloon}=-F_{balloon - air}$. So the force acting on the balloon (from air) is $F_{air - balloon}$, and the equal and opposite force (acting on the air) is $F_{balloon - air}$. But the question is which represents the equal but opposite force acting on the balloon. Wait, maybe the question is wrong, but among the options, the only one that makes sense is "the air entering the balloon" because the air entering exerts a force on the balloon, and the balloon exerts an equal and opposite force on the air, but the force on the balloon's opposite (in terms of action - reaction) is the force on the air. But since the options are about what acts on the balloon, maybe the intended answer is "the air entering the balloon" as the action force, and the reaction force (on the balloon) – no, I think I have to go with the air entering the balloon as the correct option.

# Answer:
A. the air entering the balloon

Sovi.AI - AI Math Tutor

QUESTION IMAGE

Question

Explanation:

Answer: