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How can we prove that the forces acting on a body can form a closed-up

  1. Nov 24, 2011 #1
    How can we prove that the forces acting on a body can form a closed-up polygon?
     
  2. jcsd
  3. Nov 25, 2011 #2
    Re: Equilibrium

    If they didn't, then there would be a resultant force. The magnitude of the resultant is zero only if the other forces form a closed polygon. The condition for equilibrium is, of course, no net force
     
  4. Nov 25, 2011 #3
    Re: Equilibrium

    If there are no forces or only two forces on the object then that object could be in equilibrium but the force vectors can't be connected to form a polygon.
     
  5. Nov 25, 2011 #4
    Re: Equilibrium

    Well you could think of the two forces case as going along a line and back along the same line.

    The idea to remember is that the sum of the force vectors is a zero vector for the object in equilibrium.
     
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