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

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


    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor
    2016 Award

    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!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: What is energy?
  1. What is Energy? (Replies: 8)

  2. What is energy? (Replies: 15)

  3. What is energy? (Replies: 3)

  4. What is energy? (Replies: 9)

  5. What is energy? (Replies: 19)