Where does Newton's stuff stand today?

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SUMMARY

Newton's three laws of motion remain valid fundamental principles for classical mechanics, applicable at speeds significantly lower than the speed of light (c) and energies above the continuum limit. However, they are not applicable in relativistic contexts or quantum mechanics, where Einstein's equations provide a more accurate description of motion. Newton's laws serve as first-order approximations in these advanced scenarios, highlighting their limitations as speeds approach c.

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  • Understanding of classical mechanics principles
  • Familiarity with Einstein's theory of relativity
  • Knowledge of quantum mechanics fundamentals
  • Concept of the continuum limit in physics
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  • Study Einstein's equations of motion in the context of special relativity
  • Explore the implications of quantum mechanics on classical laws
  • Research the concept of the continuum limit and its significance in physics
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Besides the second law's issue with SR, are Newton's 3 laws still considered to be true FUNDAMENTAL laws of motion? If not, why?
 
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All of Newton's laws are considered valid given speeds much smaller then c and energys above the continum limit. That means we do not use them at relativistic speeds and for quantum mechanics. Within their realm they are as valid today as they were 400yrs ago.

At relativistic speeds Newtons laws are only a first order approximation to the full equations derived by Einstein.
 
"All of Newton's laws are considered valid given speeds much smaller then c and energys above the continum limit. That means we do not use them at relativistic speeds and for quantum mechanics."

For clarification... are you saying that the first and third law also have problems when approaching c? Also, what is the continuum limit, and why does it present problems for the 3 laws?
 

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