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I have a question on forces anyone help me

  1. Apr 27, 2003 #1
    what condition of forces must prevail for a body, acted upon by a number of forces:
    1) to be equilibrium
    2) not to be in equilibrium[?]
     
  2. jcsd
  3. Apr 27, 2003 #2

    Integral

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    1) The vector sum of all forces must equal 0
    2) The vector sum of all forces not 0
     
  4. Apr 27, 2003 #3

    Tom Mattson

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    In addition to the "zero net force" condition, it also must be specified that opposing forces have the same line of action. Otherwise, you could have a force couple acting on an extended object. That would be zero net force, but a nonzero torque, which is not an equilibrium state.

    An easy way to include this would be to add to Integral's answer:

    1. ...and zero net torque.
    2. ...or nonzero net torque.
     
  5. Apr 29, 2003 #4
    Re: Re: i have a question on forces anyone help me

    Hi Jimmy/Tom,
    Don't forget the dipolar loop induced magnetic force that is opposed and equal to the torque in a quantum orbital. Cheers, Jim
     
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