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Direction of Acceleration

  1. Sep 17, 2008 #1
    Three forces acting on an object are given by vectors F1=(-2i + 2j)N, F2 = (5i - 3j)N, and F3 = (-45i)N. The object experiences an acceleration of magnitude 3.75m/s^2.

    What is the direction of acceleration?

    So far i've got the resultant vector, but i'm not sure what to do with the vector.
     
  2. jcsd
  3. Sep 17, 2008 #2

    Redbelly98

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    Welcome to Physics Forums, Nanoath!

    What equation or equations are you familiar with, that have to do with forces and acceleration?
     
  4. Sep 17, 2008 #3
    I'm familiar with kinematic equations and newtons laws.


    So far i've gotten the resultant vector and used tan^-1(1/42) to find an angle of 1.364, i just need to know if i'm on the right track.
     
  5. Sep 17, 2008 #4

    Redbelly98

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    Yes, you're on the right track. A couple of comments:

    1. The direction of the force, 1.364 degrees, is measured relative to what (i.e., counterclockwise from +x axis, or something else?)

    2. One of Newtons laws will give you the acceleration direction, given the force direction.
     
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