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    physicssneeded's Avatar
    physicssneeded Posts: 0, Reputation: 1
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    #1

    Jan 9, 2011, 02:29 PM
    Physics help - average force
    How would you estimate the average force applied on a baseball during the action of pitching the ball (mass of ball is between 142g and 149g and the initial velocity of the ball is 0m/s).
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jan 10, 2011, 10:50 AM

    1. Estimate the time the ball is in contact with the bat.
    2. Estimate the speed the ball leaves the bat.

    Then use the formula:



    where dp is the change in momentum (product of mass and velocity).
    where dt is the change in time.

    EDIT: As says the comment of jcaron2, switch the 'bat' with the 'arm/hand'.
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    jcaron2 Posts: 986, Reputation: 204
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    #3

    Jan 10, 2011, 12:20 PM
    Comment on Unknown008's post
    Except substitute the pitcher's arm in place of the bat, since the question was about pitching, not hitting. But that's just semantics; the formula is the same either way.
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    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Jan 10, 2011, 11:00 PM

    Hm... I need to put that word in my vocabulary, sorry for the misunderstanding and thanks jcaron2 for pointing it out :o

    Okay, the pitcher is the one who throws the ball with the 'giant glove' got it.
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    ebaines Posts: 12,131, Reputation: 1307
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    #5

    Jan 11, 2011, 06:40 AM

    In case the OP is not familiar with calculus - the impulse/momentum equation equation can be expressed as:



    or

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