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# Sir Isaac Newton's Law of Universal Gravitation

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on 5 June 2013#### Transcript of Sir Isaac Newton's Law of Universal Gravitation

Physicist and Mathmatician ISAAC NEWTON Isaac Newton's Explanation of Gravity Isaac Newton's Historical Impact Newton's Modern Impact So an apple fell on to Isaac Newton's head while he was asleep... Once the apple struck Newton's head the Universal Law of Gravitation popped in to his head. How wonderful...right? WRONG!!! Isaac Newton was merely observing an apple fall from a tree when it all started. No bruising of the head was involved. The idea didn't just get smacked in to his brain by the apple either, it took some time to develop. When observing the apple fall from the tree, Newton realized that the acceleration of the apple had to be caused by some kind of force. Newton thought about this for a bit... He eventually concluded that gravity may even reach the Moon. He saw that the Moon orbiting the Earth is just a result of gravitational force. This force could manipulate the course of the Moon just so that it continues to orbit the Earth. How it all began... Newton conducted a hypothetical experiment. If a projectile were shot forward on Earth, gravity would pull it down. If the muzzle velocity for this projectile were raised, the projectile would land a little farther than it did before. Newton concluded that if the velocity of the projectile was JUST right, its downward curve due to gravity would line up with the curvature of the Earth, putting it in to orbit. Isaac Newton's Universal Law of Gravitation states that gravitational force is universal. This law says that all things are attracted to one another by gravitational force. Newton found that gravitational force is equal to the masses of two objects, which is why objects with higher mass have a stronger gravitational attraction towards one another. From this Newton created the equation he is most known for... Newton also saw that gravitational force was inversely proportional to the distance between two objects squared. This meant that the greater the distance between two objects, the weaker the gravitational force. The gravitational force and the distance of two objects are inversely proportional so that if the distance is doubled, the gravitational pull would be decreased by a factor of 2 squared. If the distance was tripled, the gravitational pull would be decreased by a factor of 3 squared, and so on. He was born December 26, 1642 That's the same year Galileo died. He was born in Woolsthorpe, Lincolnshire, England. His father had died three months before his birth. When he was born, he wasn't expected to survive, let alone become a successful physicist and mathematician. This concludes the main part of Newton's Universal Law of Gravitation. Newton published a book called "Principia". It was unexpectedly successful in the physics perspective. After publishing this book, Newton became more public. He was chosen to represent Cabridge in Parliament. He became friends with John Locke and Nicolas Fatio de Duillier. Newton became very successful in London. He was chosen as the Master of the Mint, and became a good administrator. Newton also became president of the Royal Society. He was reelected every year leading up to his death in 1727. Newton's Principia completely changed the way of thinking for physicists. Newton's Pincipia may have been successful, but it didn't receive a fully positive response from philosophers. Newton's law created a foundation for science and gave people a better veiw of the universe. People learned why planets orbit around each other, and why the Earth pulls everything towards its center. Philosophers didn't approve of his views at first, but eventually adopted them. But they eventually got over it. Newton made very important contributions to modern day science. Newton enhanced our understanding of the universe and his discovery of gravitational force helped modern scientists achieve many things. Newton's discovery of universal gravitation gives modern scientists more insight to the universe. This insight greatly improved physics. Newton's explanation of universal gravitation helps modern scientists create better technologies to explore the universe more in depth. He also made scince more independent from religion. His book, "Principia" is the most influential boko in all of science.

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