This animation demonstrates Sir Isaac Newton's three laws of motion that laid the foundation for classical mechanics.
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According to the law of action and reaction (Newton’s 3rd law), when one object exerts a force on another object, the second object simultaneously exerts a force on the first object. The two forces are equal in magnitude and opposite in direction. This means that forces always act in pairs.
This principle is also used in rockets. The action is the force produced by the expulsion of gasses of combustion from the nozzle. The reaction force propels the rocket in the opposite direction.
Our feet exert a force on the ground and the ground pushes back against our feet with the same force. The force that attracts the Earth to an object is equal to the force that attracts an object to the Earth.