AST101H1 Lecture Notes - Lecture 8: Escape Velocity, Ellipse, Tidal Locking

• School: UTSG
• Department: Astronomy and Astrophysics
• Course: AST101H1
• Professor: Bryan Gaensler, C. Barth Netterfield, Ilana MacDonald

Document Summary

1st law: object in motion remains unless acted upon by outside force. 2nd law: acceleration is proportional to force and inversely proportional to mass a=f/m. 3rd law: for every force there is an equal and opposite reaction force. If you add up momentum of everything in a closed system, will find that no matter what happens, momentum is conserved. If you add up angular momentum of everything in a closed system, will find that no matter what happens, momentum is conserved. There is a force between any two objects in universe. Force is proportional to product of masses of each object. Force is inversely proportional to square of distances. There is nothing opposing force of gravity. He is accelerating in an ellipse around earth, therefore he feels weightless. Path of objects is described by newton"s laws. Object can strike earth, orbit or escape from earth depending how fast it"s going. Velocity required to escape earth is called escape velocity.