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Homework Help: Potential Energy

  1. Dec 19, 2013 #1
    ImageUploadedByPhysics Forums1387442898.459376.jpg ImageUploadedByPhysics Forums1387442917.808617.jpg To find the force we will differentiate the function with respect to x (dx)
    My problem is with the solution
    If we differentiate:
    dU/dx = 9x^2 - 7

    From where does the negative come from also the j component?
  2. jcsd
  3. Dec 19, 2013 #2
    You should have used the homework template, then you have written the relevant equations. What equation is relevant for finding force from potential energy?
  4. Dec 19, 2013 #3
    F = dU/dx
  5. Dec 19, 2013 #4
    That is not correct.
  6. Dec 19, 2013 #5
    Correct me if I am wrong
  7. Dec 19, 2013 #6
    Why are you disregarding the y-component when you differentiate?
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