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Universal law of gravitation

  1. Mar 2, 2010 #1
    Newton's universal law of gravitation states that every bodies in this universe attracts each other.Was newton able to explain the reason for this attraction?
  2. jcsd
  3. Mar 2, 2010 #2
    No. We can't even explain it today. But Einstein expanded the discussion to include not ony mass but energy and pressure...via the Einstein tensor.....somehow all are related at some fundamental level....
  4. Mar 19, 2010 #3
    How did newton prove that ,

    F = (Gm1m2)/r2
  5. Mar 21, 2010 #4
    This doesn't prove how or why they are attracted this is only used to find the force due to gravity between the two objects.
  6. Mar 22, 2010 #5
    The Law of Universal Gravitation is just that: a law. It is a mathematical relationship derived from empirical observation.
  7. Mar 22, 2010 #6
    Is this a homework question? This direcly pertains to an oft quoted passage in Principia: "hypotheses non fingo..."; I make no hypothesis...
  8. Mar 22, 2010 #7

    Filip Larsen

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    Gold Member

    To my knowledge he did show that from his law of gravitation (and some assumptions) you can derive Kepler's laws of planetary motion, which up to that point were more or less unexplained. I'm no historian, but according to Bate [1], Newton didn't originally publish his results due to a small inconsistency when he applied his theory to calculate the position of the moon and only by chance 20 years later through conversations with Halley did he get around to start working on Principia.

    [1] Fundamentals of Astrodynamics, Bate, Mueller, White. Dover, 1971.
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