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From where does earth get energy for rotation?

  1. Aug 9, 2011 #1
    from where does earth get energy for rotation???as its rotating means its doing some motion to work again sun's gravity soo from where does earth gets this energy?
     
  2. jcsd
  3. Aug 9, 2011 #2

    russ_watters

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    Staff: Mentor

    No, the earth is not doing work against the sun, so no input is required.
     
  4. Aug 9, 2011 #3
    but anyhow how earth gets energy for rotation?
     
  5. Aug 9, 2011 #4

    russ_watters

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    Staff: Mentor

    Like I said, no energy input is required. That is due to Newton's first law and conservation of energy.
     
  6. Aug 9, 2011 #5
    google... "why do planets rotate"

    And once they "start" they don't need energy, as Russ explained.
     
  7. Aug 10, 2011 #6
    Once something is rotating, it doesn't need energy to keep on rotating. In fact, it needs energy to STOP it from rotating.
     
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