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Absolute force

  1. Aug 19, 2011 #1
    Can we consider gravitational force acting on a body considered as absolute force:-) if so pleas explain
  2. jcsd
  3. Aug 19, 2011 #2


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    Please define your meaning of 'absolute force'.
  4. Aug 19, 2011 #3


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    In GR, accelerations are absolute, so any force can be measured absolutely, including fictitious forces, such as gravity.
  5. Aug 19, 2011 #4


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    Can you explain more? I agree with the first part. To me, that means, in GR, there is no such thing as fictitious forces, and gravity is not a force at all. Any proper acceleration is due to a real, non-gravitational source (EM, etc), reflecting deviation from inertial motion, latter determined by stress/energy=curvature.
  6. Aug 19, 2011 #5


    Staff: Mentor

    The kind of acceleration which is absolute is called proper acceleration. Coordinate acceleration is not absolute, and fictitious forces produce coordinate acceleration, not proper acceleration.
  7. Aug 20, 2011 #6


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    Ugh. Don't know what I was thinking. Disregard my previous post.
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