# Action and Reaction or Conservation of Momentum?

• tksxkdhkd11
In summary, when a natural frequency acts on a coke bottle, it resonates and causes the lump of air in the neck of the bottle to undergo simple harmonic motion, increasing and decreasing pressure periodically. This phenomenon is explained by both Newton's 3rd Law and Conservation of Momentum, which are essentially the same principle. The strength of the wind or velocity of fluid is affected by the flux, as stated by the principle of Conservation of Momentum.
tksxkdhkd11
Basically, when a natural frequency acts on coke bottle, It resonates. During the resonance, the lump of air in neck of it goes under simple harmonic motion. It goes in and out the bottle, increasing and decreasing pressure of cavity of coke periodically.
When air goes inside the bottle, the bottle does not move. However, when air flows out, it moves toward opposite direction of the opening.
Why do you guys think this phenomenon happens?
My teacher gave me two explanations.
First one is about Action and Reaction. He related it to the directions pressure acts on and net force change that occurs when air goes in the cavity.
Second one was about conservation of momentum.
He said that conservation of momentum occurs when air flows out and same thing to "feynman sprinkler" occurs when air flows in. Which one do you think is more plausible??
Can you explain to me why you explain to me why such is the answer? To me, both explanations can be applied.
Also, can momentum of lump of air be calculated? If so, HOW?

Lastly, something not related to this, but is it the flux that affect strength of wind or velocity of fluid?

Newtons 3rd Law (Action & Reaction) and Conservation of Momentum are basically the same thing, stated in two different ways. Force is the transfer of Momentum. If for each transfer there is an equal but opposite transfer, then total amount is conserved.

## 1. What is the law of action and reaction?

The law of action and reaction, also known as Newton's third law of motion, states that for every action, there is an equal and opposite reaction. This means that when an object exerts a force on another object, the second object exerts an equal and opposite force back on the first object.

## 2. How does the law of action and reaction relate to conservation of momentum?

The law of action and reaction is closely related to the principle of conservation of momentum. This principle states that the total momentum of a closed system remains constant. In other words, the momentum of an object before and after a collision or interaction will be the same. This is because the force of the action and reaction cancel each other out, resulting in no net change in momentum.

## 3. Can the law of action and reaction be applied to all types of forces?

Yes, the law of action and reaction applies to all types of forces, including contact forces (such as pushing or pulling) and non-contact forces (such as gravitational or electrical). However, it is important to note that the forces must be acting on different objects for the law to be applicable.

## 4. How can the law of action and reaction be observed in everyday life?

The law of action and reaction can be observed in many everyday situations. For example, when a person jumps off a boat, the boat moves backwards due to the force of the action and reaction. Another example is when a rocket launches into space, the force of the rocket pushing down on the ground (action) creates an equal and opposite force pushing the rocket upwards (reaction).

## 5. Are there any exceptions to the law of action and reaction?

No, there are no exceptions to the law of action and reaction. It is a fundamental law of physics that has been proven through countless experiments and observations. However, it is important to note that the forces must be acting on different objects for the law to be applicable. If the forces act on the same object, they will not cancel each other out and the law will not apply.

• Mechanics
Replies
11
Views
1K
• Mechanics
Replies
2
Views
2K
• Mechanics
Replies
15
Views
3K
• Mechanics
Replies
16
Views
3K
• Mechanics
Replies
46
Views
3K
• Mechanics
Replies
13
Views
2K
• Mechanics
Replies
4
Views
1K
• Mechanics
Replies
11
Views
2K
• Mechanics
Replies
15
Views
7K
• Mechanics
Replies
5
Views
1K