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Angular Momentum and Torque Problemo

  1. Nov 20, 2015 #1
    1. The problem statement, all variables and given/known data
    Consider two forces F and -F that act at different points on an extended object. Show that the net force of this combination is zero and that the torque about any point P is independent of the location of P, and depends only on the separation of the two points at which the forces act.

    2. Relevant equations
    So this basically revolves around the concept of equilibrium.

    3. The attempt at a solution
     
  2. jcsd
  3. Nov 20, 2015 #2

    SteamKing

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    Skoob, you're new to PF. PF Rules require that you fill out all three parts of the HW Template when you post a thread so you can get help. Merely typing in the question without showing an attempt at solution just wastes your time and doesn't lead to anything productive. PF is not a HW service.
     
  4. Nov 20, 2015 #3
    It's about a force couple.
     
  5. Nov 20, 2015 #4
    is it because the forces are equal in magnitude and opposite directions so the net force is zero??
     
  6. Nov 20, 2015 #5

    haruspex

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    That is wrongly worded. It should say "depends only on the separation of the lines of action of the two forces". That is, it is not whole the separation of the two points, only the component of that separation that is at right angles to the two forces.
     
  7. Nov 20, 2015 #6
    And on the magnitude of F.
     
  8. Nov 20, 2015 #7

    haruspex

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    Yes, but I let that pass since F is clearly given as an input.
     
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