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Homework Help: Hard vector addition T_T

  1. Nov 27, 2008 #1
    HELP !!! this problem is very very confusing T_T

    Three forces, each of which is perpendicular to the
    other two, act on an object. If the magnitudes of
    these forces are 6 N, 15 N, and 10 N, respectively,
    find the magnitude and direction of the resultant.
    (State the angles that the resultant makes with the
    two larger forces.)
    Last edited: Nov 27, 2008
  2. jcsd
  3. Nov 27, 2008 #2
    show an attempt at a solution and draw a diagram. it'll help.
  4. Nov 27, 2008 #3
    Think Cartesian coordinate system
  5. Nov 28, 2008 #4
    if they are all perpendicular to each other then they can all lie on different axis of a 3D cartesian style graph. what is the average way are they all pointing?
  6. Nov 29, 2008 #5

    This is what the diagram looks like from my book i have it online.
    Last edited by a moderator: Nov 30, 2008
  7. Dec 1, 2008 #6
    it's been a while since I did vector diagrams, but can't you just find the resultant force and angle from the two large forces and then find the new resultant of the small force and the old resultant? You obviously have to use trig to work out the angles and magnitudes.
  8. Dec 1, 2008 #7
    No i cant thats why im posting this problem up.
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