AY 101 Lecture Notes - Lecture 5: Radiant Energy, Kinetic Energy, Potential Energy
Document Summary
Newton"s universal law of gravitation 1/26/2018 5:53:00 pm. What is gravity: a force derived from matter, acts at a distance, always attractive. Attraction is directly proportional to the product of their masses. Attraction is inversely proportional to the square of the distance between their centers. Law 1: an orbiting object is in freefall towards earth, but due to the amount of sideways motion and speed of the orbit they never hit. Law 2: planets move faster at perihelion and slowest at aphelion: the gravitational force pulls along the line joining the planet and the sun. Telescope: a mechanical device designed to collect light from the sky. Resolve fine details (that aren"t visible to naked eye) Velocity the speed and direction of a moving object. Uniform motion motion in a fixed direction at constant speed. Accelerated motion when velocity is changing (speed, direction, or both)
