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!

Power associated with net force

  1. Dec 5, 2015 #1
    1. The problem statement, all variables and given/known data

    How to prove :

    ##P*F_net=((dK)/(dt))##
    i.e. power associated with the net force is the rate of change of kinetic energy.

    3. The attempt at a solution

    if I use the definition of power ans then that of work I get (m*a*ΔS )*(F_net)
    further using F_net=ma
    LHS= ##m^2*a^2*ΔS##

    There is no question along with it for which I could have though about the system and forces.
    so I am assuming const force and acceleration.
     
  2. jcsd
  3. Dec 5, 2015 #2

    cnh1995

    User Avatar
    Homework Helper

    Is that product of force and power on LHS? If yes, the equation looks dimensionally incorrect.
    Actually, if you solved dK/dt first, you'll get power.
     
    Last edited: Dec 5, 2015
  4. Dec 5, 2015 #3
    so sorry ,actually the F_net was written as the subscript P ,not their product
    this makes complete sense now
    ##P_F=(dK/dt)##
     
  5. Dec 5, 2015 #4

    cnh1995

    User Avatar
    Homework Helper

    Then I believe answer is a couple of steps away. Good luck..
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Power associated with net force
  1. Net forces (Replies: 1)

  2. Net Force? (Replies: 17)

  3. Net Force and Net Work (Replies: 1)

  4. Net Force (Replies: 3)

Loading...