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Old Dec 21st 2014, 11:02 PM   #1
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Post 3rd Law of motion

A horse pulls the cart, if action and reaction are equal how does the horse move?
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Old Dec 22nd 2014, 07:24 AM   #2
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The horse pulls forward on the cart and the cart pulls backward on the horse. But at the same tie the horse's hooves push against the ground and the ground pushes forward on his hooves.
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Old Dec 28th 2014, 05:34 PM   #3
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To take it even further:
The Earth react to the force applied by the horses hooves by shifting a tiny fraction in the opposite direction to the motion of the Horse.
The amount by which the Earth moves is truly minuscule (due to the vastly different masses of horse and earth) and is literally "lost in the noise"
However the 3rd law indicates that this movement exists.
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