CAS AS 102 Chapter Notes - Chapter 4: Orbital Speed, Aswan, Empirical Relationship
Document Summary
Tradition to understand nature without resorting to myth or supernatural. Used mathematics to give precision to their ideas. Greeks were first people known to make scientific models of nature. Syene to alexandria distance = 5000 stadia angle. Kepler"s second law: as a planet moves around its orbit, it sweeps out equal areas in equal times. Kepler"s third law: more distant planets orbit the sun at slower average speeds, obeying the precise mathematical relationship. A = average distance from sun in au. Speed: rate at which object moves = distance/time. Acceleration = rate of change in velocity (m/s^2) Acceleration of falling object is called acceleration of gravity. G is same for all falling objects, regardless of their mass. On earth, g is approximately 10m/s^2: speed increases. Net force: changes momentum, which generally means an acceleration as long as its mass remains constant. Whenever an object accelerates, a net force causes that acceleration.
