# AST201H1 Chapter 4: chapter 4 astronomy

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###### AST201H1 Full Course Notes

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## Document Summary

3 major categories of energy: kinetic energy: energy of motion, kinetic energy of moving object is 0. 5(m)(v squared) 22 or 4 www. notesolution. com basically: fg = g (m1 * m 2) / d2 where fg = force of gravitational attraction, m = mass of two objects, d = distance between their centers, g = gravitational constant. G = 6. 67 x 10-11 m3 / (kg * s2) Planets are not the only object with elliptical orbits, any objects going round another object obey the first two laws of kepler. Ellipses are not the only possible orbital paths, ellipses are possible for bound orbits (orbits in which an object goes around another object over and over again) Newton found unbound orbits or paths that bring an object close to another object just once. Unbounded still follow the 2nd law where closer to object is faster and farther is slower.