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Homework Help: Net Force

  1. Dec 10, 2009 #1
    1. The problem statement, all variables and given/known data

    Three concurrent forces, F1, F2 and F3, act on a block that is placed on a
    horizontal surface. The resultant force on the block is 20.0 N at 0°. If F1 = 10.0 N
    at 40° and F2 = 20.0 N at 180°, calculate the magnitude and direction of the force
    F3. Sketch a vector diagram (not to scale) illustrating your solution.
  2. jcsd
  3. Dec 10, 2009 #2


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    Homework Helper

    What have you tried so far?
  4. Dec 10, 2009 #3
    i drew the forces on the block.
    then i found the f1 on x and y component ..
    f1x= 10cos40 = 7.67N
    f1y= 10sin40 = 6.43N
    i know that the sum of all forces will give me 20n, is that right?
    and .. the f2 is pushing the block in side < ----
    but im not sure how find the f3 on x and y component..
    if i found it,
    i know that i have to plug in
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