Sir ** Isaac Newton** was a French German scientist.

**was a physicist, astronomer, theologian, English mathematician and author. He gave principles of modern physics, including the**

*Newton***laws of motion**and is credited as one of the great minds of the 17th-century Scientific Revolution.

## Early life & Education

** Isaac Newton** was born on 04 January 1643 (old style 25 December 1642) in woolsthorpe, Colsterworth, Lincolnshire, England. He was the only child of his parents

**and**

*Isaac***. When Newton was born he was very weak and thus was not expected to survive. His father Isaac was a prosperous local farmer and was died three months before Newton's birth.**

*Hannah Ayscough Newton*When Newton was about three, his mother, Hannah Ayscough Newton, married a minister, Barnabas Smith, and went to live with him, leaving young ** Newton** with his motherly grandmother. Newton doesn't like his step father. His mother had three children's from her second marriage. When Newton was twelve years old his step father passed away.

Newton enrolled in king's school in Grantham, Lincolnshire. When his step father died, his mother pulled him out of school to make him a farmer because she thought that Newton should manage her now considerable property. Since, He could not bring himself to concentrate on farming, he was again sent to a grammar school in Grantham. On recommendation of his uncle, "** Rev William Ayscough**" Newton was admitted to Trinity College, Cambridge. Newton was ready to matriculated, By June 1661, but he was older than the other undergraduates because of his interrupted education.

During first three years at Cambridge, Newton was taught the standard curriculum but was fascinated with the more advanced science. Newton got his scholarship in 1664, which was for four year's until he could complete his master's. He discovered the generalised "binomial theorem" in 1665, began to develope calculus. In August 1665, Newton get his BA degree and soon after Cambridge University temporarily closed as a precaution against the Great Plague. Newton returned to Cambridge, in April 1667 and was elected as a fellow of Trinity, in October 1667.

In 1669, he completed his MA and became a lucasian professor of mathematics, at age of 26. After this he was elected a FRS, (Fellow of the Royal Society) in 1672. In 1705, Newton was knighted by Queen Anne. He also served as Warden the Royal Mint from 1696 upto 1699, and Master of the Royal Mint from 1699 upto 1727.

## Newton's Discoveries and inventions

Newton discovered theories and concept in the field of optics, motion and mathematics.

## Newton's laws of motion

By his 18 months effortless work, Newton published "Philosophiae Naturalis Principia Mathematica" (Mathematical Principles of Natural Philosophy), which is often known as Principia, in 1687. Principia is said to be the single most influential book on physics. Principia, contains information on nearly all of the essential concepts of physics except energy and gives an exact quantitative description of bodies in motion, with three basic laws of motion:

### (i). First law

"A body continues in its state of rest, or in uniform motion in a straight line, unless acted upon by an external force".

### (ii). Second law

"Force acted upon a body is equal to mass times acceleration, and a change in motion is proportional to the force applied".

### (iii). Third law

"For every action, there is an equal and opposite reaction".

### The Apple myth

** Newton** came back to home, between 1665 and 1667, because of university was temporarily closed due to great plague. This time is considered as the time when Newton first experienced his famous inspiration of gravity with a falling apple. It is not clear that whether the Apple hit his head or it fall all the ground. This incident lead Newton, to wonder why this apple fell straight down and not at and thereafter Newton's explored the laws of motion and gravity.

## Newton's theory of gravity

Newton’s law of universal gravitation states that "Two objects attract each other with a force of gravitational attraction. this attraction is proportional to masses of that bodies and inversely proportional to the square of the distance between their centers. This law helped in explaining elliptical planetary orbits and many universal motions.

Newton's in 1668, designed and constructed a reflecting telescope. Newton theorized that white light is a composite of all colors of the spectrum, and that light was composed of particles. He used it to study optics and to prove his theory of light and color.

## Achievements

Sir Isaac Newton has a very important role in field of science specially in physics. He also discovered laws and formulas of mathematics. He also written a book about mathematical principles of natural philosophy. Some important discoveries and inventions of Newton are :

- Newton's three laws of motion- first law of motion is called the law of inertia. The second law is known as the Law of acceleration. Third Law of motion is known as law of action and reaction.
- Newton discovered infinitesimal calculus.
- Newton invented reflecting lenses for telescope by which world's view for universe changed. By this invention formation of a clear image of an object placed on a far distance is possible.
- Newton discovered the law of universal gravitation.
- Newton discovered basic principles of modern physics etc.

## Presidency of royal Society

Newton was elected president of the Royal Society upon Robert Hooke's death, in 1703 and held this position upto 1727. In 1705, in a dispute, German mathematician Gottfried Leibniz publicly accused Newton by claiming he had discovered infinitesimal calculus several years before the publication of Principia. For the investigation of this matter, the Royal Society appointed a committee in 1712 and this committee concluded Newton's priority over the discovery.

## Newton's Last years and death

In last years of his life, Newton lived with his niece, Catherine Barton and her husband John Conduitt Cranbury Park, near Winchester, England. At this time, Newton became one of the most famous men in Europe. His discoveries were unchallenged. He also had become healthy, by investing his sizable income wisely.

When Newton turned 80, he started having digestive problems. In March 1727, Newton experienced a strong pain in his abdomen and blacked out. He died at the age of 84, on 31 March 1727.

“Gravity explains the motions of the planets, but it cannot explain who sets the planets in motion.”

**~Isaac Newton**

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