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Homework Help: Momentum eww

  1. Feb 3, 2010 #1
    Momentum!!! eww

    A) what is the momentum of an 8-kg bowling bowl rolling at 2- m/s?
    I got this answer which in p=16 kg times m/s

    B)If the bowling bowl rolls into a pillow and stops in 0.5 sec, calculate the average force it exerts in the pillow?

    C)What is the average force that the pillow exerts on the ball?

    please hwlp i have no idea!!
     
  2. jcsd
  3. Feb 3, 2010 #2

    rock.freak667

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    Re: Momentum!!! eww

    Do you know Newton's 2nd law?

    F=(mv-mu)/t
     
  4. Feb 3, 2010 #3

    tiny-tim

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    Welcome to PF!

    Hi sweetpea1993! Welcome to PF! :smile:

    Force = rate of change of momentum. :wink:
     
  5. Feb 3, 2010 #4
    Re: Momentum!!! eww

    hey,
    yes I know this but I'm not for sure how to put the numbers into the equation..
    nice names lol :)
     
  6. Feb 3, 2010 #5

    tiny-tim

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    ?? :confused:

    rate of change of momentum = change of momentum divided by time. :smile:
     
  7. Feb 3, 2010 #6
    Re: Momentum!!! eww

    yeah... okay so (8kg times 2m/s)- whats u stand for??
    grrr i have a headache
     
  8. Feb 3, 2010 #7
    Re: Momentum!!! eww

    HEY!!! I figured it out... you take the 16 which converts into newtons times sec times 0.5 which gives you 8 newtons!!
     
  9. Feb 4, 2010 #8

    tiny-tim

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    (just got up :zzz: …)

    No, force = change of momentum divided by time.
     
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