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Inertial frame of reference

  1. Aug 13, 2007 #1
    What forces affect on the Moon in the Inertial frame of reference which is the Sun?
    +gravity form the Sun
    +gravity from the Earth
    +centrifugal force from the rotationary movement of the Moon round the Earth


    is this list correct?
     
  2. jcsd
  3. Aug 13, 2007 #2

    Doc Al

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    Sounds good. I suspect the effect of other planets would be negligible.
    Centrifugal force is a "fictitious" force that appears when viewing things from a non-inertial rotating frame; it's not relevant in an inertial frame.
     
  4. Aug 14, 2007 #3
    Yes, I know that there isn't any centrifugal force in this frame from the rotating movement round the Sun, so we cannot include any fictitious forces in an inertial frame?
     
  5. Aug 14, 2007 #4

    Doc Al

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    That is correct: no fictitious forces in an inertial frame.
     
  6. Oct 13, 2007 #5
    A question from Polish Physics Olympiad again...
     
  7. Oct 13, 2007 #6
    How do you call the force that prevents the moon falling into/to the earth ?
     
  8. Oct 13, 2007 #7

    Doc Al

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    Staff: Mentor

    What prevents the moon from falling into the earth is its speed, not a force. If you were to remove gravity, the moon would just keep going in a straight line.
     
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