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Homework Help: Hockey stick impact on puck

  1. Nov 22, 2009 #1
    1. The problem statement, all variables and given/known data

    Note the picture...

    An ice hockey puck with a mass at 0.20 kg has a velocity of 12 m/s before being struck by the hockey stick. After the impact the puck moves in the new direction shown with a velocity of18 m/s. If the stick is in contact with the puck for 40 ms, compute the magnitude of the average force F exerted by the stick on the puck during contact, and find the angle θ made by F with the x-direction.

    2. Relevant equations

    3. The attempt at a solution

    Can someone let me know if this was done correctly

    Fxt = mvx --> Fx(.04) = .2(-18cos20-12)....Fx = -144.57 N

    Fyt = mvy--> Fy(.04) = .2(-18sin20-0)...Fy = -30.78 N

    F = (Fx2 + Fy2)1/2 = 147.81 N

    Q = arctan Fy/Fx) = 12.02 degrees

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    Last edited: Nov 22, 2009
  2. jcsd
  3. Nov 23, 2009 #2


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    Looks good.
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