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Finding the derivative of the radial vector r

  1. Feb 1, 2017 #1
    1. The problem statement, all variables and given/known data
    How do you find the derivative of the radial vector r

    2. Relevant equations
    r
    = ru'_r + ru_r

    [tex] r = \frac{dr}{dt}u_r + r\frac{du_r}{dt} [/tex]

    can't get latex to work either

    3. The attempt at a solution

    If r is the magnitude of r, how would you find the derivative of it? Wouldn't it be constant?
     
    Last edited: Feb 1, 2017
  2. jcsd
  3. Feb 1, 2017 #2

    kuruman

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    Gold Member

    It would be constant only if the object is at rest or moving in a circle.
     
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