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NON coplanar forces, please i need help thanks

  1. Jul 27, 2009 #1
    1. The problem statement, all variables and given/known data

    Find the resultant of three coplanar concurrent forces, f1 north a magnitude of 8 grams, F2 of magnitude 12 grams and acting southwest f3 of magnitude 5 grams and acting southeast Find the resultant in an easterly and northerly direction.

    known values:
    F1 = 8 grams North
    F2 = 12 grams Southwest
    F3 = 5 grams Southeast

    2. Relevant equations
    R=f1+f2+f3

    N

    /|\ (arrow up sorry dont know how to put a diagram here)
    |
    | F1 = 8 grams
    |
    |
    / \
    / \ F3 = 5 grams
    / \
    F2=12 grams / \
    V V

    3. The attempt at a solution

    In norhtern resultant: R=8 + 12 + 5 = 25 grams
    In eastern am confused if i am going to add it again? and in my first eauation dont know if am right? please help me thanks
     
  2. jcsd
  3. Jul 27, 2009 #2
    oh no... my diagram.... :( sorry this is my first time to join in a forum so dont know how to put a diagram.. but please help me thanks
     
  4. Jul 27, 2009 #3

    rl.bhat

    User Avatar
    Homework Helper

    Your northern resultant is wrong. All the forces are not acting along the same direction.
    Do you know how to resolve the vectors along vertical and horizontal direction?
     
  5. Jul 27, 2009 #4
    thanks for the reply, actually, no, i tried to search anything in the net but i cant understand.. please help me... thanks again
     
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