Physics, asked by Akshrana, 1 year ago

Information about contribution of Newton in Physics?

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Answered by graxx
4
Hi there

Besides his work on universal gravitation (gravity), Newton developed the three laws of motion which form the basic principles of modern physics. His discovery of calculus led the way to more powerful methods of solving mathematical problems.

Newton returned to Cambridge in 1667. Soon he became a professor at Cambridge. His first major public scientific achievement was the invention, design and construction of a reflecting telescope, one which ensured his election to membership in the Royal Society. The mirror used in this telescope gave a sharper image than was possible with a large lens because a lens focuses different colours at slightly different distances, an effect called chromatic aberration. Nowadays, the usage of compound lenses cuts out this aberration, but mirrors are still used in large telescopes.

By the end of 1675 Newton worked out the corpuscular or emission theory of light, and showed how it would account for all the various phenomena of geometrical optics, such as reflection, refraction, colours, diffraction, etc.

In a 1679 letter, Robert Hooke wrote to Newton, suggesting that a formula involving the inverse squares might explain the attraction between planets and the shape of their orbits. After a series of exchanges with Hooke, Newton broke off the correspondence and formulated his own work on planetary motion, reaching some definite conclusions by 1680, though he kept his discoveries to himself. In 1684, Edmond Halley met Newton at Cambridge to motivate him to work on Hooke’s ideas on planetary motion and cast them mathematically. Newton claimed to have solved the problem some 18 years earlier during his hiatus from Cambridge during the plague, but he was unable to find the notes. With Halley’s encouragement and financial support, in 1687, after 18 months of intense and effectively nonstop work, Newton published his most acclaimed work, Philosophiae Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy) – physics and science were known in those days as Natural Philosophy – hailed as the single most influential book on physics.

Newton’s Laws Of Motion:
The Principia offered an exact quantitative description of bodies in motion in three basic laws:

1) A stationary body will stay stationary unless an external force is applied to it.

2) Force is equal to mass times acceleration, and a change in motion is proportional to the force applied.

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

These three laws and his theory of universal gravitation helped explain not only elliptical planetary orbits but nearly every other motion in the universe: how the planets are kept in orbit by the pull of the sun’s gravity; how the moon revolves around Earth; and how comets revolve in elliptical orbits around the sun. The laws also allowed Newton to calculate the mass of each planet, calculate the flattening of the Earth at the poles and the bulge at the equator, and how the gravitational pull of the sun and moon create the Earth’s tides.

Upon the publication of the first edition of Principia, Robert Hooke immediately accused Newton of plagiarism, claiming that he had discovered the theory of inverse squares and that Newton had stolen his work. The charge was unfounded, as most scientists knew, for Hooke had only theorized on the idea and had never brought it to any level of proof. However, Newton was furious and strongly defended his discoveries. But Hooke did not give in, keeping alive his contentions until his death in 1703.

Most modern historians believe that Newton and Leibniz developed calculus independently, although with very different notations. But Newton published almost nothing about it until 1693, and did not give a full account until 1704, while Leibniz began publishing a full account of his methods in 1684. This led to a longstanding dispute between Leibniz and Newton as to who was the first to have developed calculus.

The Whitest Soul:
In appearance Newton was short, and towards the close of his life rather stout, but well set, with a square lower jaw, brown eyes, a broad forehead, and rather sharp features. His hair turned grey before he was thirty, and remained thick and white as silver till his death. As to his manners, he dressed untidily, was rather disinclined to physical effort, and was often so absorbed in his own thoughts as to be anything but a lively companion. In character he was religious and conscientious, with an exceptionally high standard of morality, having, as Bishop Burnet said, “the whitest soul’’ he ever knew. He suffered nervous breakdown twice, once in 1678 and a second time in 1693.


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Answered by SAFAL1
1
He state the three laws of motion ie.
#1 An object continois to remain at rest or in a state of uniform motion unless an external unbalanced force acts on it.
#2The rate of the change of momentum is proportional to the applied force and the change of momentum occurs in the direction of the force.
#3Every action force has an equal and opppsite reaction force which acts simultaneously.
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