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Translational Equillibrium, how do i show my work?

  1. Jan 10, 2010 #1
    12. Three horizontal forces are acting at the same point on a puck lying on a level frictionless
    table. The puck is in translational equilibrium.
    Two of these forces are:
    F1 = 10.2 N, east
    F2 = 15.4 N, 30° E of N
    What is the magnitude of the third force?

    I can figure out the answer quite easily, I add F1 and the horizontal component of F2 together, and use Pythagorean theorem to find the resultant of the new Fx component and F2y to find the resultant, and the force to place it in equilibrium would be the negative of that vector.

    How do i show my work for this.. Im sure i cant just say its the opposite of the net force.
  2. jcsd
  3. Jan 11, 2010 #2


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    If F(R) is the resultant of F1 and F2, for equilibrium F3 + F(R) = 0.
    Or F3 = - F(R)
  4. Jan 11, 2010 #3
    thank youu ! that'd make sense. :)
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