Is Action&Reaction Strictly Synchronous

In summary, electric charges can have attractive or repulsive forces on each other, and these are based on the exchange of particles. Einstein's theory of relativity tells us that no message can travel faster than the speed of light, which may affect the formation of these forces. There are different assumptions about how these forces are formed, but ultimately, electric charge and energy are conserved and can be transferred between charges through fields and waves.
  • #1
NERV
12
0
I have got a problem:
It's well known that two electric charges have either attractive or repulsive forces on each other.
And Einstein told us that there is no message that can travel at a speed beyond c.
Besides I was told that the actions and reactions between the two charges are based on the exchange of some kind of particles.

So, here comes the question.Let's assume the following condition:
There is one fixed charge(+)(named A),and put another neutral point(B) somewhere at a distance.If we charge B(-), it must send out a message to the A. This may be a wave. And the point B itself soon got an attractive force,which was always believed given by A.How was this force formed?My assumptions are:
1. This force was formed once B sent out the message or wave.
2. This force was formed after A received the message.A received the message, and sent something back, so that when B received, B got a force.

If we choose the former, it's hard to answer how B had been "informed" the quantity of A---as no message can travel beyond c---so that the message can act on B as a force with respect to the Coulomb Law.
If we choose the latter(preferable as I think), it is possible to make a machine, which can charge and discharge object B in ultra-high frequency, so that before the message is returned, B had already been discharged and no reaction force is formed---therefore it became possible to make a UFO?
 
Physics news on Phys.org
  • #2
NERV said:
I have got a problem:
It's well known that two electric charges have either attractive or repulsive forces on each other.
And Einstein told us that there is no message that can travel at a speed beyond c.
Besides I was told that the actions and reactions between the two charges are based on the exchange of some kind of particles.

So, here comes the question.Let's assume the following condition:
There is one fixed charge(+)(named A),and put another neutral point(B) somewhere at a distance.If we charge B(-), it must send out a message to the A. This may be a wave. And the point B itself soon got an attractive force,which was always believed given by A.How was this force formed?My assumptions are:
1. This force was formed once B sent out the message or wave.
2. This force was formed after A received the message.A received the message, and sent something back, so that when B received, B got a force.

If we choose the former, it's hard to answer how B had been "informed" the quantity of A---as no message can travel beyond c---so that the message can act on B as a force with respect to the Coulomb Law.
If we choose the latter(preferable as I think), it is possible to make a machine, which can charge and discharge object B in ultra-high frequency, so that before the message is returned, B had already been discharged and no reaction force is formed---therefore it became possible to make a UFO?

Firstly, you cannot create or destroy charge; you can only move it from one place to another.

According to the classical theory of electromagnetism, which is compatible with special relativity, a charge at rest or in uniform motion has an associated field, which effectively contains energy and momentum that can be transferred to another charge acted on by that field. If the source charge is moved in a non-uniform way, that causes changes to propagate within its field at c (in a vacuum, or slower in some other materials), associated with flows of energy and momentum. Rapid changes may cause some of the energy to be radiated away in the form of electromagnetic waves. Overall, electromagnetic energy and momentum are locally conserved everywhere.

In quantum theory, it is less easy to say exactly where energy and momentum are located and whether they are really continuously conserved, or only on average. However, the general effect is still the same.
 
  • #3


It is not entirely accurate to say that action and reaction are strictly synchronous. While it is true that in the case of electric charges, there is a delay between the action and reaction due to the exchange of particles, it is not always the case in other situations.

In the scenario described, it is important to clarify that the force between charges A and B is not formed solely by the exchange of a message or wave. The force is a result of the interaction between the two charges and the electric field they create. The exchange of particles simply allows for the transmission of this force.

In addition, the idea of a machine being able to charge and discharge object B at an ultra-high frequency to prevent the reaction force is not feasible. The speed of light is a fundamental limit that cannot be surpassed, so even with a machine operating at ultra-high frequency, the reaction force would still occur, albeit with a slight delay.

Furthermore, the concept of a UFO being created by manipulating the reaction force between electric charges is not supported by scientific evidence. The laws of physics still apply in such scenarios, and the creation of a UFO would require a violation of these laws.

In conclusion, while there may be a delay between the action and reaction of electric charges, it is not accurate to say that they are strictly synchronous. The force between charges is a result of their interaction and cannot be manipulated by simply manipulating the exchange of particles.
 

Related to Is Action&Reaction Strictly Synchronous

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 will also exert a force back on the first object in the opposite direction.

2. Is action and reaction always synchronous?

No, action and reaction do not always occur at the same time. According to Newton's third law, the forces are equal and opposite, but they can act on different objects and at different times. For example, a rocket exerts a force on the exhaust gases, causing it to accelerate in one direction, while the exhaust gases exert an equal and opposite force on the rocket, causing it to accelerate in the opposite direction.

3. Can action and reaction act on the same object?

Yes, action and reaction can act on the same object. For example, when you push on a wall, the wall pushes back with an equal and opposite force. In this case, the action and reaction forces are acting on the same object (the wall) but in opposite directions.

4. Does the mass of objects affect action and reaction?

Yes, the mass of objects does affect action and reaction. According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This means that for the same force, a more massive object will have a smaller acceleration compared to a less massive object.

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

Yes, there are a few exceptions to the law of action and reaction. One example is when there is an external force acting on the objects, causing the forces to not be equal and opposite. Another exception is when the forces are not acting along the same line of action, causing them to not cancel each other out completely.

Similar threads

  • Special and General Relativity
Replies
1
Views
717
  • Special and General Relativity
2
Replies
51
Views
2K
  • Sci-Fi Writing and World Building
Replies
6
Views
907
Replies
8
Views
1K
  • Special and General Relativity
Replies
17
Views
2K
  • Advanced Physics Homework Help
Replies
3
Views
1K
Replies
31
Views
2K
  • Mechanical Engineering
Replies
12
Views
4K
  • Science Fiction and Fantasy Media
Replies
14
Views
2K
  • Special and General Relativity
Replies
27
Views
4K
Back
Top