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Newton's Third Law
These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects.
http://www.physicsclassroom.com/class/newtlaws/Lesson-4/Newton-s-Third-Law