NATS 1745 Study Guide - Midterm Guide: David Korten, Thought Experiment, Bowling Ball

• School: York University
• Department: Natural Science
• Course: NATS 1745
• Professor: Robin Metcalfe

Document Summary

Kepler(cid:1442)s 1st law: planets(cid:1442) orbits are elliptical with the sun at one focus. Kepler(cid:1442)s 2nd law: planets move faster when they are closer to the sun; they sweep out (cid:1445)equal (cid:1441)areas(cid:1442) in equal times(cid:1446) Kepler(cid:1442)s 3rd law: concrete mathematical relation between period of a planet (p = time taken for a planet to orbit sun), and distance from sun (a): **however, didn"t know why they moved the way they did. Kepler"s laws apply to any object, orbiting another object, under the influence of gravity. Kepler realized the sun must be responsible for emanating a force to keep the planets in orbit. He thought the sun had a magnetic force to keep the planets in orbit. Kepler"s laws mark a great turning point in the history of science. They would later be interpreted as a natural outcoming of gravity, as explained by isaac newton.