The three laws of motion formulated by Isaac Newton laid the foundation of classical mechanics. Newton published these in his Philosophae Naturalis Principia Mathematics (Mathematical Principles of Natural Philosophy) in the year 1687. The laws of motion are still used to get people to the Moon.
Newton’s first law takes hints from Galileo’s observations. Newton redefined Galileo’s observation that an object in motion will continue moving in the absence of a force. As Newton’s first law is a restatement of the law of inertia which Galileo had already described, Newton appropriately gave credit to Galileo.
Newton’s first law states that the velocity (speed and direction) of an object only changes if a force acts on it. The second law states to what extent the object’s velocity will be changed by a given force. The third law states that when a body exerts some force on another one, the second will apply an equal force in the opposite direction, that is, every action has an equal and opposite reaction.
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