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Homework Help: Point mass potential

  1. Nov 27, 2006 #1
    If I have a point mass that experiences a force

    [tex]\vec{F}(\vec{r}) = - \frac{k}{r^2} \vec{e_r} -mg \vec{e_z}[/tex]

    is it correct that the potential is

    [tex]V = - \frac{k}{r} + mgz[/tex]

    ??
     
  2. jcsd
  3. Nov 27, 2006 #2

    dextercioby

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    By the unit vectors used, apparently one uses the cylindric coordinates. Did you check that [itex] \vec{F}=-\nabla U [/itex] using cylindric coordinates ?

    Daniel.
     
  4. Nov 27, 2006 #3
    Yeah that's correct. Can I interpret this as a particle next to a vertical cable or something?
     
  5. Nov 27, 2006 #4

    dextercioby

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    I ain't got a clue.

    Daniel.
     
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