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    lh_santos's Avatar
    lh_santos Posts: 1, Reputation: 1
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    #1

    Dec 9, 2007, 04:32 PM
    Newton's 3rd Law
    When a horse pulls on a cart, the cart pulls on the horse with an equal but opposite force. How is the horse able to pull the cart?
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Dec 9, 2007, 04:47 PM
    The horse pushes on the Earth. You need to think about that for a while, the horse and cart are not the only things in the system.
    terryg752's Avatar
    terryg752 Posts: 197, Reputation: 4
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    #3

    Dec 9, 2007, 07:10 PM
    Horse pushes the earth, true.

    But that alone will not move the horse forward.

    What moves it forward is the force of friction between the horse and the earth.

    Without friction, the horse will keep slipping without moving forward.
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