AST201H1 Lecture Notes - Lecture 3: Electric Field, Weightlessness, Wind Wave

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST201H1
• Professor: Marija Stankovic

Document Summary

Difference between circle and the ellipse, two points, focus. How far apart they are will tell us how stretch out it will be. Orbital period, p (time taken to complete one orbit) oc (proportional to) a3 (orbital semimajor axis, a. Half of the longest axis of an ellipse) Gravity is a universal force between all objects having mass. Earth has a much larger mass, so that is why it is so strong. Gravity is unique because it only ever adds up- there is no anti-gravity . This property allows gravity to dominate all other forces on large scales, even though it is by far the weakest force. F= g(m1 x m2 / d x d) Our mass and earth"s mass and distance between us and the earth. More pull you have, the higher your weight is. Smaller mass, smaller gravitational pull, less of a pull so you weigh more. (insert slide)