1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Science Advisor

    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].
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook