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    Vinchel's Avatar
    Vinchel Posts: 2, Reputation: 1
    New Member
     
    #1

    Sep 8, 2007, 12:09 PM
    Velocity Physics
    Why it is easier to stop a tennis ball than a cricket ball moving with the same speed?
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Sep 8, 2007, 02:20 PM
    Well, you have to absorb the kinetic energy, work out the kinetic energy for a tennis ball and a cricket ball travelling at the same speed.
    makdan's Avatar
    makdan Posts: 46, Reputation: 3
    Junior Member
     
    #3

    Sep 8, 2007, 05:35 PM
    Absorbing all the kinetic energy makes sense, but Wikipedia (last time I looked) states that momentum essentially represents how hard it is to stop something. Since kinetic energy and momentum have different formulas, can someone explain in greater detail?
    tfashina's Avatar
    tfashina Posts: 4, Reputation: 1
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    #4

    Sep 13, 2007, 11:34 AM
    Try absorbing all the kinetic energy
    Sanjay Persad's Avatar
    Sanjay Persad Posts: 110, Reputation: 0
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    #5

    Nov 12, 2007, 07:28 PM
    In simple terms when the cricket ball comes in contact with your hand it expends more kinetic energy as it has a greater mass. The tennis ball is lighter and expends less kinetic energy.
    terryg752's Avatar
    terryg752 Posts: 197, Reputation: 4
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    #6

    Nov 13, 2007, 04:52 PM
    According to the principle of "Conservation of Momentum", this makes lot of sense.

    A cricket ball, having much greater mass than a tennis ball, has a much greater momentum than the latter.

    When the cricket ball hits my hand, and if I do not, for example, move my hand while it hits my hand, the skin and flesh of my hand are given the momentum of the ball and therefore I hurt a lot: I donot move my hand, but the skin and flesh of my hand get a lot of impact. My hand stays still, but skin and flesh move. They move much faster than in the case of tennis ball because of greater momentum of
    The cricket ball.

    That's why, it is advised that while catching a moving ball, especially a cricket ball, we move our hand backward. In this way it will hurt less.
    terryg752's Avatar
    terryg752 Posts: 197, Reputation: 4
    Junior Member
     
    #7

    Nov 14, 2007, 04:10 AM
    Another approach:

    Rate of change of momentum = impressed force

    The momentum of a Cricket ball being much more than that of a tennis ball, the force
    required to stop a cricket ball is much more.

    Hence more force (action and reaction) accurs between your hand and the cricket ball
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #8

    Nov 15, 2007, 03:21 AM
    You can also consider inertia. A body of higher mass (cricket ball) is more difficult to stop than one of lower mass (tennis ball)
    kesavan's Avatar
    kesavan Posts: 118, Reputation: 1
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    #9

    Nov 15, 2007, 09:19 AM
    tennis ball's momentum is lower than cricket ball , because mass is law
    momentum= mass* velocity
    F=change of momentum/time
    so easier to stop a tennis ball
    Physics Goddess's Avatar
    Physics Goddess Posts: 6, Reputation: 2
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    #10

    Nov 19, 2007, 06:35 PM
    Comment on kesavan's post
    This is correct. Change in momentum is related to force, not energy.
    itsme_vipsdude's Avatar
    itsme_vipsdude Posts: 29, Reputation: 0
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    #11

    Dec 25, 2007, 06:55 AM
    It is because of momentum...
    We alll know that rate of change of momentun with respect to time gives the force exerted... thus we observe that force exerted by cricket ball is greater

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