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Friday, September 26, 2014

Give a brief account of Newton’s law of motion.

Newton’s law of motion is given below-

In 1687 in his book Philosophiae Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy) the greatest English physicist Sir Isaac Newton first introduce the three laws of motion.
The laws are-


1. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.

2. The vector sum of the forces F on an object is equal to the mass m of that object multiplied by the acceleration vector a of the object. Mathematically we can express the law as F=ma.

3. Every action has an equal and opposite reaction. In other word we can say that when one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.