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Homework Help: Impulse momentum problem

  1. Apr 3, 2013 #1
    1. Problem statement and all known variables
    The world champion head butter Angus Macbangus can accelerate himself from rest to head-butting speed of 8.5m/s. Since the upper body is involved in a properly executed head-butt, the effective mass of the head is 24kg. (Label the direction the head moved as +i. Assume linear motion at the moment of impact.)

    a) what impulse does Angus produce?
    b) if Angus reaches butting speed in 0.5s, what power must his muscles produce?
    c) if Angus head-butts an opponent in the face and his head comes to rest in a time of 0.15s, what is the magnitude and the direction of the force that the opponents face experience?

    2. Related equations
    Momentum/impulse equations
    Kinetic energy 1/2mv^2

    3. Attempt
    Just checking to see if my work is correct.
    For part c, the force that the opponent experiences is the equal to the force I found but in the opposite direction?

  2. jcsd
  3. Apr 4, 2013 #2


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    Science Advisor
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    All looks about right.
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