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Impulse and impulsive force and momentum

  1. Jun 21, 2011 #1
    1)anyone tells me what is the differences between impulse and impulsive force??

    2) impulsive force = force X time
    momentum = mass X change in velocity
    impulse force = momentum. i know why but i dont understand why impulsive force is same as momemtum, if i want to decribe something about the punch of the frighter, i should say impulsive force ?? and when i should say it is momentum not impulsive force??
     
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  3. Jun 21, 2011 #2

    WannabeNewton

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    [tex]J = F\Delta t = ma\Delta t = m\frac{\Delta v}{\Delta t}\Delta t = m\Delta v = \Delta p[/tex] where J is the impulse. Impulse is the change in momentum not simply momentum =D.
     
  4. Jun 21, 2011 #3
    for impulse formula is (mv-mu)/t ???
     
  5. Jun 21, 2011 #4

    WannabeNewton

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    what is u in your formula?
     
  6. Jun 21, 2011 #5
    u= initial velocity, v=final velocity
     
  7. Jun 21, 2011 #6

    WannabeNewton

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    Your formula is fine except there is no factor of 1/t. It is simply, in accordance with your notation, J = mv - mu.
     
  8. Jun 21, 2011 #7
    Impulse is the change in momentum, and is given the symbol J.

    Impulsive force is the force that acts to create the impulse, and has the symbol F.

    [tex]\mathbf{J}=m\mathbf{v}-m\mathbf{v_0}=\mathbf{F}t[/tex]

    So an equation for impulsive force would be what you posted above:

    [tex]\mathbf{F}=\frac{m\mathbf{v}-m\mathbf{v_0}}{t}[/tex]
     
  9. May 6, 2012 #8
    example for impulse and impulsive force???
     
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