These laws define the effect that the absence or presence of a force has on objects. Every action has an equal and opposite reaction.The force acting on a body is defined as the rate of change of its linear momentum, with time.Every object stays in its state of rest or uniform motion, unless disturbed by an external force.Newton’s laws of motion defined the concept of inertia and force. Newton’s second law of motion defines a ‘Force’ Newtown’s Second Law of Motion First Law of Motion: An object will continue moving (or staying still) unless acted upon by an external force Second Law of Motion: Force = Mass x Acceleration Third Law of Motion: When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction to that of the first body. Here are his major contributions to theoretical physics. “Truth is ever to be found in the simplicity, and not in the multiplicity and confusion of things.” Read the Principia One of Newton’s quotes, precisely proves the point Like Newton, another theoretical physics giant, Albert Einstein was also guided by simplicity and elegance in his thinking about physical laws. The principle that guided Newton’s discoveries was simplicity. The greatest of Newton’s discoveries came when he experienced pristine solitude, in which he could meditate on his vague ideas and assimilate them together into a logically coherent whole. Creating the great generalizations which bind all the loose threads of clues into a coherent whole, is an art that has been mastered by only a few till date. In this book, (fondly referred to as the Principia by scientists), he synthesized what was known, into a logically whole and consistent theoretical framework, through his laws of motion and theory of gravitation. In 1687, the sum total of his discoveries in mechanics were published in the legendary book Philosophiæ Naturalis Principia Mathematica (Latin for Mathematical Principles of Natural Philosophy). Sir Isaac Newton contributed to many branches of human thought, among which physics and mathematics were the fields in which he contributed substantially. Photograph: Cambridge University Library/PA Original manuscript by Sir Isaac Newton, one of several by the English physicist to be made available on the web. Newton’s Discoveries in Theoretical Physics Newton’s Magnum Opus – The Principia Here’s a quick tour of his most important discoveries. His co-discovery of calculus provided a potent mathematical tool, aiding the precise analytical treatment of the physical world.

His discovery of the gravitational force gave man the ability to predict movements of celestial objects, while simultaneously validating Kepler’s laws and the heliocentric Copernican model of the solar system.Newton’s three laws of motion set the foundation for modern classical mechanics.One of the greatest scientists of all time, Sir Isaac Newton’s discoveries led to a deeper understanding of nature and gave physics (known as Natural Philosophy in his time) a firm physical and mathematical foundation. An inherent curiosity about the world, an appreciation of beauty, the excitement of exploring a mystery and a relentless pursuit of truth are the prime driving forces of a creative mind. This thought offers a rare insight into the workings of great minds like Newton. I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me. Isaac Newton’s discoveries gave physics its theoretical foundation, granted powerful tools to mathematics and created a launch pad for future developments in science.

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