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Homework Help: Power associated with net force

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

    How to prove :

    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


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    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
  5. Dec 5, 2015 #4


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    Then I believe answer is a couple of steps away. Good luck..
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