Physics Help Forum 3rd Law of motion

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Dec 21st 2014, 10:02 PM #1 Junior Member   Join Date: Dec 2014 Posts: 1 3rd Law of motion A horse pulls the cart, if action and reaction are equal how does the horse move?
 Dec 22nd 2014, 06:24 AM #2 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,331 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.
 Dec 28th 2014, 04:34 PM #3 Senior Member     Join Date: Apr 2008 Location: Bedford, England Posts: 668 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. __________________ You have GOT to Laugh !

 Tags 3rd, action, dynamics, law, motion, newtonlaws, reaction

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