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Force vectors: How to determine the directions of their components

  1. Oct 16, 2016 #1
    • Thread title changed to reflect problem description
    1. The problem statement, all variables and given/known data

    Replace the force system by an equivalent resultant force and couple moment at point P. Suppose thatF1 = 455 N and F2 = 700 N . (Figure 1)

    Hibbeler14.ch4.p97a.jpg
    2. Relevant equations


    3. The attempt at a solution

    I found the solution to the problem. My question is how do I know which direction the components for the force vectors are pointing? I keep messing up the signs for F(x) & F(y). I must have missed something somewhere along the way. Please advise.
     
  2. jcsd
  3. Oct 16, 2016 #2

    gneill

    User Avatar

    Staff: Mentor

    Your attempt at a solution is actually your question. That question should be your problem statement, with the given problem set as an example.

    What are your relevant equations? How do you determine the components of vectors? How did you solve the problem and where did you run into difficulty with the signs of vector components? Can you show an example?

    We need to see what you're doing in order to determine how to advise you.
     
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