AS101 Chapter Notes -Inverse-Square Law, Net Force, Orbital Period
Document Summary
Speed: the rate at which an object moves (metres/second) Acceleration: the rate of change of velocity with time speed up acceleration slow down - deceleration) turning(change of direction) Motion of all objects is a result of the forces(pull/push) acting on them. 3 universal laws : an object remains at rest or at constant velocity unless a net force acts to change its speed/direction. Orbital motion: an object orbiting earth, and any orbiting object, is actually falling(being accelerated due to gravitational force) toward earth"s centre. An object in a stable orbit continuously misses earth because of its horizontal velocity: objects orbiting each other actually revolve around their mutual centre of mass, the difference between closed orbits and open orbits. If you want to leave earth never to return, you must give your spaceship a high enough velocity so it will follow an open orbit.
