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Vectors -

  1. Dec 22, 2007 #1
    [SOLVED] vectors -

    1. The problem statement, all variables and given/known data

    At time t = 0 two forces f1 = (i + j) and f2 = (2i - 2j) start acting on a point body of unit mass lying stationary at the point (1,2) of the x,y plane. Describe the trajectory r(t) of the plane.

    2. Relevant equations

    F = ma

    a = d2x/dt2

    3. The attempt at a solution

    Total force, F = (i + j) + (2i - 2j)
    F = (3i - j)

    I know I need to integrate using the acceleration equation but I'm confused by the x,y plane, I thought it was meant to be in i,j plane? :S Could someone please explain?
    Thanks!
     
  2. jcsd
  3. Dec 22, 2007 #2

    Hootenanny

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    i and j are unit vectors in the direction of the positive x and positive y direction respectively, so you're still working in the x-y plane.
     
  4. Dec 22, 2007 #3
    thanks, so do i split it like this, d2x /dt2 = 3 and d2y /dt2 = -1 and then when I integrate to get x and y, put it back into i and j form?
     
  5. Dec 22, 2007 #4

    Hootenanny

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    Sounds good to me :approve:
     
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