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Homework Help: Hw help with vector natur of newton's second law of motion

  1. Sep 27, 2006 #1
    only two forces act on an object (mass = 3.00 kg). 40.0N east and 60.0N north of east at 45 degrees. Find the magnitude and the direction (relative to the x axis) of the acceleration of the object.

    I don't really know where to begin.
  2. jcsd
  3. Sep 27, 2006 #2


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    Staff: Mentor

    Add the components of the two vectors to make a sum vector. Add the two components in the N direction to get the N sum, and add the two components in the E direction to get the E sum. How do you break up the 2nd vector into its N and E components? All you need is a little trig.
  4. Sep 27, 2006 #3
    Use the relationships: [tex] F_{x} = F\cos\theta, F_{y} = F\sin\theta [/tex]
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