The Newton's third law of motion states that there's an equal and opposite reaction force to every applied force. Suppose I take a water bottle. I push it i.e apply force on it. Owing to the Newton's third law of motion , the bottle will exert an equal force on me in the opposite direction. So how am I able to move the bottle?
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Answer:
You probably know that the Earth pulls down on you. What you might not realize is that you are also pulling up on the Earth. For example, if the Earth is pulling down on you with a gravitational force of 500 N, you are also pulling up on the Earth with a gravitational force of 500 N. This remarkable fact is a consequence of Newton's third law.
Newton's third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A.
This law represents a certain symmetry in nature: forces always occur in pairs, and one body cannot exert a force on another without experiencing a force itself. We sometimes refer to this law loosely as action-reaction, where the force exerted is the action and the force experienced as a consequence is the reaction.
We can readily see Newton’s third law at work by taking a look at how people move about. Consider a swimmer pushing off from the side of a pool, as illustrated below.
A swimmer pushes on the wall with her feet, which causes the wall to push back on her feet due to Newton's third law. Image credit: Adapted from Openstax College Physics
The swimmer pushes against the pool wall with her feet and accelerates in the direction opposite to that of her push. The wall has exerted an equal and opposite force back on the swimmer. You might think that two equal and opposite forces would cancel, but they do not because they act on different systems. In this case, there are two systems that we could investigate: the swimmer or the wall. If we select the swimmer to be the system of interest, as in the image below, then Fwall on feetF_{\text{wall on feet}}Fwall on feetF, start subscript, start text, w, a, l, l, space, o, n, space, f, e, e, t, end text, end subscript is an external force on this system and affects its motion. The swimmer moves in the direction of Fwall on feetF_{\text{wall on feet}}Fwall on feetF, start subscript, start text, w, a, l, l, space, o, n, space, f, e, e, t, end text, end subscript. In contrast, the force Ffeet on wallF_{\text{feet on wall}}Ffeet on wallF, start subscript, start text, f, e, e, t, space, o, n, space, w, a, l, l, end text, end subscript acts on the wall and not on our system of interest. Thus Ffeet on wallF_{\text{feet on wall}}Ffeet on wallF, start subscript, start text, f, e, e, t, space, o, n, space, w, a, l, l, end text, end subscript does not directly affect the motion of the system and does not cancel Fwall on feetF_{\text{wall on feet}}Fwall on feetF, start subscript, start text, w, a, l, l, space, o, n, space, f, e, e, t, end text, end subscript. Note that the swimmer pushes in the direction opposite to that in which she wishes to move. The reaction to her push is thus in the desired direction.
Other examples of Newton’s third law are easy to find. As a professor paces in front of a whiteboard, she exerts a force backward on the floor. The floor exerts a reaction force forward on the professor that causes her to accelerate forward.
Similarly, a car accelerates because the ground pushes forward on the drive wheels in reaction to the drive wheels pushing backward on the ground. You can see evidence of the wheels pushing backward when tires spin on a gravel road and throw rocks backward.
In another example, rockets move forward by expelling gas backward at high velocity. This means the rocket exerts a large backward force on the gas in the rocket combustion chamber, and the gas therefore exerts a large reaction force forward on the rocket. This reaction force is called thrust. It is a common misconception that rockets propel themselves by pushing on the ground or on the air behind them. They actually work better in a vacuum, where they can more readily expel the exhaust gases.
Helicopters similarly create lift by pushing air down, thereby experiencing an upward reaction force. Birds and airplanes also fly by exerting force on air in a direction opposite to that of whatever force they need. For example, the wings of a bird force air downward and backward in order to get lift and forward motion.
Explanation:
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Answer:
According to Newton's third law there is an action- reaction force .
When you push the bottle , there is an equal and opposite force applied by the bottle on your hand . Let's say you push the bottle with the force of 2N and so does the bottle (on your hand ) but due to the difference in masses ( inertia) ,the bottle moves but you don't feel the force on your hand probably because it wasn't enough to stimulate pain or pressure receptors in your skin.
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