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joshua mafnas

on 21 December 2012

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Transcript of physics

History Gravitational Theory Aristotle Galileo Generally describe the life and times of Isaac Newton, including his personal life. Describe his major scientific contributions, including his contribution to the theory of gravity. Kepler Isaac Newton Isaac Newton Aristotle differed most sharply from medieval and modern thinkers was in his belief that the universe had never had a beginning and would never end; it was eternal. Kepler then came up with his laws of planetary motion—the planets move in elliptic orbits around the sun and the closer a planet comes to the sun, the faster it orbits. Newton was born in 1642 and lived until 1727. He was a scientist of high caliber. His contributions to the world of mechanics, mathematics and optics were well received. He was also an alchemist. On his birth he was so tiny that he could easily be fitted into a quart mug.

Though born in a family of farmers, the man was not a good farmer. Give a brief overview of how gravity and motion of the planets were viewed historically before Newton. include the views of Aristotle, Galileo, and Kepler Galileo studied motion especially that of freely falling bodies. He saw a problem with the Aristotelian theory of motion because it required a stationary earth so he developed his own theory of motion. He is probably best known for a story in which he dropped two different size balls from the Leaning Tower of Pisa at the same time. The two balls hit the ground at almost the same time which led him to formulate the law of freely falling bodies. There is no evidence that he actually conducted this experiment, but he was the first scientist to use the results from experiments for evidence for a scientific theory. He also experimented with pendulums and formulated the law of the pendulum. • According to his gravity theory, the planets keep moving. And movement at such great scale is only possible because of some higher and mighty power, and this great power is that of the God. What was the major contribution of Henry Cavendish to the universal law of gravitation? Describe his primary experiment Cavendish Experiment To calculate the force of gravity between two objects you need to have the masses of the two objects, the distance between the two objects, and the gravitational constant. What role does the equivalence of the inertia and gravitational properties of mass play in the development of general relativity? Axiomatic assumption How does gravity correspond to the bending of the space- time fabric? Gravity is everywhere in the universe no matter where you are. If you think about how "time" is defined, it is completely at the mercy of gravity. If the gravity in our solar system were to be completely turned off, space and time relative to us would bend beyond recognition because our planet would be speeding through the galaxy. What is the Schwarzchild Radius? A radius defined for a body of a given mass and proportional to that mass, such that if the body is smaller than that radius, the force of gravity is strong enough to prevent matter and energy to escape from within that radius. Hope You Enjoy!=) What are black holes, and are they real? A region of space having a gravitational field so intense that no matter or radiation can escape. Astrophysicists generally agree that black holes exist How does gravity bend light?
What is gravitational lensing? -Regardless of the mass of the object, the acceleration caused by gravitational pull is the same for any object. -a heavy, dense body, as a galaxy, that lies along our line of sight to a more distant object, as a quasar, and whose gravitational field refracts the light of that object, splitting it into multiple images as seen from the earth. what are worm holes? are they real? -A wormhole is a pathway from one part of space and time to another more distant location. -Wormholes are allowed to exist in the math of "General Relativity", which is our best description of the Universe. Assuming that general relativity is correct, there may be wormholes. But no one has any idea how they would be created, and there is no evidence for anything like a wormhole in the observed Universe. Theory Hypothesis
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