Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Relativistic dynamics

  1. Feb 23, 2006 #1
    is the use of consevation laws compulsory in relativistic dinamics?
  2. jcsd
  3. Feb 23, 2006 #2
    this is an ill-posed question, your works need to comply with conservation laws at all times (relativity or not)
  4. Feb 23, 2006 #3
    i think the question is well-posed. the derivation can be accomplished without using the conservation laws and to show after that the derived relativistic momentum and mass comply with them.
  5. Feb 23, 2006 #4
    Then why do you ask? Prove it.
    Even if you follow these steps (you seem to already have a paper "up your sleeve") it still means that you are employing the conservation laws (after the fact instead of before). So is this another set-up for another one of your self-promoting links to another one of your archived papers?
    Last edited: Feb 23, 2006
  6. Feb 24, 2006 #5

    Tom Mattson

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Well of course you know what you mean! :biggrin:

    Let's look at the question again, shall we?

    I think this question turns on what you mean by "use".

    When you say "use" are you referring to the explicit invocation of the conservation laws when doing calculations in relativistic dynamics? Or are you referring to the use of statements which are not explicit statements of the conservation laws, but from which those laws follow deductively? It sounds from your responses like you mean the latter, in which case I would agree. Newtonian dynamics is equivalent to the conservation laws, and the latter needn't be referred to outright when doing dynamical calculations.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook