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What is energy?

  1. Aug 14, 2012 #1
    I have seen some definition like,
    It is a quantity that is coming from the time translational invariance. or a quantity that should be conserved in some process.
    But I am not able to understand what exactly energy is?
    In STR mass even can convert into energy, that also make me so confused. So everything can be converted into energy.
    I conclude that everything is actually nothing but energy.
    But I find still there are lot of problem of thinking in that way.

    Please help!!
  2. jcsd
  3. Aug 14, 2012 #2
  4. Aug 14, 2012 #3


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    https://www.physicsforums.com/blog.php?b=3203 [Broken]

    Last edited by a moderator: May 6, 2017
  5. Aug 14, 2012 #4
    ^ Ah, that's a useful page. Bookmarked!
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