# PHYA10H3 Chapter 13: Chapter 13 Notes

## Document Summary

Chapter 13: newton"s theory of gravity: the force of gravity is responsible for phenomena ranging from orbiting space shuttles, solar eclipses and the dynamics and the expansion of the universe. 13. 1 a little history: the study of the structure of the universe is called cosmology. Tycho and kepler: kepler"s work led him to find that the orbits are not circles but ellipses. 13. 3 newton"s law of gravity: newton proposed that every object in the universe attracts every other object with a force that is: The forces are directed along the straight line joining the two objects: the constant g is the gravitational constant and is proportionally constant necessary to relate the masse and measured in kilograms to the force in newton"s. G=6. 67x10^-11 nm2/kg2: the freefall acceleration given by newton"s second law is: The value of g at a height h above the erath is: with an independently determined value of g, the gravitational constant is different in nature.