1. Not finding help here? Sign up for a free 30min 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!

Force Vector into a Force (Power)

  1. Oct 14, 2008 #1
    1. The problem statement, all variables and given/known data

    Find the power input of a force vector F acting on a particle that moves with a velocity vector v for each of the following situations.
    (a) vector F = 4 N i hat + 3 N k hat , vector v = 9 m/s i hat

    2. Relevant equations

    P = F * V

    3. The attempt at a solution

    P =(4*9) +3

    Also tried

    P = SQRT(4^2+3^2) * 9
    I guess the problem is I don't know how to convert the vector 4i+3j into a force.
     
  2. jcsd
  3. Oct 14, 2008 #2

    G01

    User Avatar
    Homework Helper
    Gold Member

    That vector is the force. You have a force with an x component of 4N and a y component of 3N.

    In order to find the power you need to find the dot product of F and v:

    [tex]P=\vec{F}\cdot\vec{v}=F_xv_x+F_yv_y[/tex]

    It seems like this was what you were trying to do in your first attempt. You made one small mistake. HINT: What is [itex]v_y[/itex]?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Force Vector into a Force (Power)
  1. Power and force (Replies: 2)

  2. Power and Force (Replies: 2)

  3. Forces and Power (Replies: 2)

  4. Force and Power (Replies: 6)

Loading...