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Torque from a frame of reference

  1. Feb 4, 2016 #1
    Whenever we define torque from a frame of reference, is it necessary for the frame to be inertial?
    Please explain because I am unclear on this.
  2. jcsd
  3. Feb 4, 2016 #2


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    Yes. In e.g. an accelerating frame of reference you no longer have ##\vec \tau = I\vec\alpha##.
    Example: you sit in an accelerating car and have to lean forward to stay sitting upright. ##\alpha## of your head w.r.t. your hips is zero but you (or the backrest) do have to exercise a torque to stay with your head above your hips.
  4. Feb 4, 2016 #3
    In case of non inertial frame, a pseudo force should be taken and then we can proceed writing the torque. Right?
    Last edited: Feb 4, 2016
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