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Power and Constant Force

  1. Oct 11, 2010 #1
    A particle of mass m moves from rest at t=0 under the influence of a single constant force F. Show that the power delivered by the force at any time t is P=(F^2t)/m.
    I tried using the definition of power and the definition of the scalar product, which probably is not the way to go about doing this. I feel like there's an obvious step or equation that I'm missing here.

    P=F.v=|F||v|cos0=Fv
    mv(dv/dt)=P
     
  2. jcsd
  3. Oct 11, 2010 #2

    PhanthomJay

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    using P =Fv is good. Now you need to find v as a function of F, T, and m using newton's 2nd law (and the kinematic motion equations if it doesn't jump right out at you).
     
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