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Homework Help: Force acting on the particle is always directed towards the center

  1. Oct 2, 2012 #1
    r=acos(wt)i+bsin(wt)j is the equation(it is an ellipse)

    I need to somehow show that the force will always act towards the center.

    Is there anyone who can possibly help?
  2. jcsd
  3. Oct 2, 2012 #2


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    Gold Member

    Differentiate the equation twice with respect to t first of all, and see if you can relate the position vector to the acceleration vector.
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