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Stupid Power Question

  1. Jan 7, 2013 #1
    Is power given by [itex]\vec{F} \cdot \vec{v}[/itex], or just [itex]Fv[/itex]?

    I'm thinking it can be both if the velocity and force vectors are parallel, but I'm not sure...
     
  2. jcsd
  3. Jan 7, 2013 #2

    HallsofIvy

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    If vector [itex]\vec{F}[/itex] happens to be in the same direction as [itex]\vec{v}[/itex] then [itex]\vec{F}\cdot\vec{v}= |\vec{F}||\vec{v}|[/itex] which is what I think you mean by "Fv". In general, of course, they are not in the same direction and you must use [itex]\vec{F}\cdot\vec{v}[/itex].
     
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