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Homework Help: Statics problem equilibrium of a particle 2D

  1. Oct 3, 2015 #1
    1. The problem statement, all variables and given/known data
    In the picture

    2. Relevant equations

    In the picture
    3. The attempt at a solution
    In the picture

    My question is .. Why in Fx has sin and Fy has cos ?

  2. jcsd
  3. Oct 3, 2015 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Because of the way the angles are defined and because of how you would find the components of the forces shown. Remember how sine and cosine are defined on a triangle:

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