AST201H5 Chapter 4: AST201-Stars and Galaxies - CH4
Document Summary
Chapter 4 making sense of the universe understanding motion, energy, and gravity: a. k. a. The experience we need: how do we describe motion, speed, change of location/position (meter) in certain amount of time (second, speed = distance/time, ex. Speed if km/h which is distance over time: time = distance/speed, distance = speed x time, measurable, meter/second, ex. Earth"s orbit speed 30km/s = 108,000 km/h: convert seconds to hours; 3600 seconds in hour, 30 km/s x 3600 s/h = 108,000 km/h, ex. Sun"s orbit speed 230 km/s =828,000 km/h: velocity, not the same as speed, change in location and direction in some amount of time, units are m/s (same as speed, ex. Driving 100 km/h west is not same velocity as driving 100 km/h north: more information than speed, acceleration, change in velocity in some amount of time, units (meter/second)/second, a. k. a. m/s^2.
