AST101H1 Lecture Notes - Lecture 7: Angular Momentum, Escape Velocity

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST101H1
• Professor: Bryan Gaensler

Document Summary

Johannes kepler: (cid:449)o(cid:396)ked f(cid:396)o(cid:373) b(cid:396)ahes" data, came up with an accurate description of the motions of the planets. Keple(cid:396)"s fi(cid:396)st la(cid:449: planets orbit the sun in an elliptical pattern, with the sun at one focus. Planets travel faster in their orbit when they are closer to the sun. Keple(cid:396)"s se(cid:272)o(cid:374)d la(cid:449: planets trace out equal area in equal time. Keple(cid:396)"s thi(cid:396)d la(cid:449: more distant planets from the sun orbit slower. Galileo galilei: used a telescope to look at the sky, showed the jupiter has moons, showed that the moon has craters, observed the phases of venus. Isaac newton: revolutionized math and science (co)invented calculus, presented the idea of force and the laws of motion, described the law of gravity, his four laws can describe the motion of pretty much anything, anywhere. Keple(cid:396)"s la(cid:449)s a(cid:396)e (cid:374)atu(cid:396)al (cid:272)o(cid:374)se(cid:395)ue(cid:374)(cid:272)es of ne(cid:449)to(cid:374)"s la(cid:449)s. Speed: the rate of change of position: e. g. the car is travelling 60km per hour.