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    brijmohan123456's Avatar
    brijmohan123456 Posts: 41, Reputation: 1
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    #1

    Dec 9, 2012, 06:03 AM
    Help,help in horse cart problem of physics?
    In this problem I have to ask that horse exerts a force F on ground and reaction R is given by ground. The horizontal component of R i.e. RcosƟ push the horse forward.But I have to ask that this RcosƟ will be the reaction to horizontal component of F i.e. FcosƟ so they both will cancel each other then how RcosƟ will push the cart forward ,or as the whole R is the opposite reaction of F so it will end up in cancelling F then how any of it's component can pull the cart.Please help me as my exams are coming
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Dec 10, 2012, 07:50 AM
    Think of the horse and cart as a single entity, and consider the forces acting on it. In the horizontal direction only Rcos(theta) is acting, so the horse & cart are accelerated horizonatally according to . Now it's true that magnitude of R cos(theta) is equal to the horizontal force with which the horse pushes against the ground, but thety don't "cancel out."
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