Newton's 3rd Law of Motion-a question?

Hello,

I have a simple layman's question about "for every action there is an equal & opposite reaction":-

Whether this law is also equally applicable to moving towards Balance position of anything?

I mean, Whether moving towards Balance position of anything also cause equal Imbalance?

Best Wishes.

 

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Newton's Third Law is a statement of the conservation of momentum in the pairwise interaction of bodies.

In algebra, this can be written either as \(\Delta \vec{p}_1 \; + \; \Delta \vec{p}_2 \; = \; 0\) or \(\Delta \vec{p}_1 \; = \; - \, \Delta \vec{p}_2 \).

Newton, Sir Isaac (1729). "Axioms or Laws of Motion". The Mathematical Principles of Natural Philosophy, Volume I. pp. 20-21.

 

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Einstein used the third law and center of mass to introduce relativity (E=mc^2) to an audience of Newtonian physicists. Close enough!

 

The "force pair" mechanical model, directly applicable to your "balance point" question, is the Standard Model's precursor for boson force carriers, is likewise dependent on an analogy to Newton's third law, as is General Relativity's 'Principle of Equivalence' between inertial and gravitational masses.

In this forum and elsewhere, Newton's third law has been successfully used in arguments against things like reactionless drives, the Casimir effect (which amounts to the same thing), and perpetual motion machines. Newton's third law is nothing to be trifled with.

 

And when it comes to physics, I'm just a simple layman.

Yes, I believe that it should be.

Balance isn't exactly what Newton was talking about, even though the phrase 'equal and opposite force' arises in both cases.

If something is balanced, the forces operating on it from different directions are equal, so that the balanced object doesn't topple from an unbalanced force.

Newton's third law will apply to all of the forces acting on a balanced object, even if there's an equal and opposite force opposing it. If two children push equally hard on a toy car, one forward and one backwards, so that the toy car doesn't move, both children will feel pressure on their hands equal to the force they are exerting.

If one of the children stops pushing and removes his hand while the other child keeps pushing, so that the forces the children are exerting on the toy car are no longer balanced, the car will accelerate in the direction the remaining child is pushing. But Newton's law still applies in this unbalanced situation, and that remaining child will still feel a pressure on his hand equal to the force he's exerting. The toy car will continue to push on the child's hand just as hard as the child's hand pushes on the toy car.

That's how I see it anyway.

 

Sorry, I was involved elsewhere.

Balance, in other sense we can also say moving towards stability.

For example. a pendulum, when move towards stable position from moving position, does it attract equal and opposite reaction?

 

All others,

Thanks for reply.

Pls read my last post and guide me accordingly.

 

Thanks. Does it mean that there is no inherent/own force of an object which can make it either to move or to become stable?

 

The fan acts like a propeller pushing (or pulling) the boat in the opposite direction?

 

Thanks. How an object will behave when there is no applied force on it?

 

Thanks. Does it mean that Newton's 3rd law is not applicable to an object when it is in its natural position i.e. a position without any any outside acting force?

 

Newton's third law always applies, but if there is no second body then there is, by definition, no action of one body on a second one. No action is equal and opposite to no reaction. Thus Newton's third law applies, but is trivial in content.

 

rpenner,

Thanks.

What is the state of fundamental forces and of elementary particles? I think, one is not effected by other? If so, does it mean Newton's 3rd law is not applicable on these?

 

Thanks.

Let us go to basic level. Can fundamental forces and elementary particles also behave in this manner? Like EM force come in contact with GF?