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Length Contraction and the Conservation of Energy

  1. Apr 8, 2010 #1


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    Length contraction is one of the main aspects of relativity. However, I have a question: When something undergoes length contraction, does it become more dense or, is the decrease in length radiated in some way?

    Thank you,

  2. jcsd
  3. Apr 9, 2010 #2


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    It sounds like you're imagining length contraction as a physical change in the object. Length contraction is just a difference between measurements of the same thing made by different observers. But yes, according to an observer who sees an object as length contracted, its density would be increased.
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