# Sir Isaac Newton And Newton's Laws Of Motion

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INTRODUCTION.
Newton developed this law of motion has significant mathematical and physical elucidation that are needed to understand the motion of objects in our universe. Newton introduced the three laws in his book Philosophiae naturalis principia mathematica (Mathematical Principles of Natural Philosophy), which is generally referred to as the Principia. He also introduced his theory of universal gravitation, thus laying down the entire foundation of classical mechanics in one volume in 1687. These laws define the motion changes, specifically the way in which those changes in motion are related to force and mass. There are three laws of motion which were introduced by Sir Isaac Newton which are Newton’s First Law , Newton’s Second Law and Newton’s Third Law. Newton’s Law Of Motion also clarifies that in the given interpretation mass, acceleration, momentum, and most importantly , force are assumed to be externally defined quantities. Newton 's First Law of Motion states that a force must act upon it in order for the motion of an object to change . This is a concept which generally called as inertia. This law also states that if the net force which is the vector sum of all forces acting on an object is zero, then the velocity of the object is constant. Velocity is a vector quantity which indicates both the object 's speed and the direction of its motion. Hence, the statement that states the object 's velocity is constant is a statement that both its speed and