AST 101 Lecture Notes - Lecture 4: 2 On, Hyperbola, Tidal Acceleration
21 Jul 2016
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Document Summary
Chapter 4 - making sense of the universe: understanding. Speed: rate at which object moves (speed = distance/time) All falling objects accelerate at the same rate (not counting friction of air resistance). On earth, g roughly equals 10 m/s2: speed increases 10 m/s with each second of falling. Galileo showed that g is the same for all falling objects, regardless of their mass. A net force changes momentum, which generally means an acceleration (change in velocity). A weight scale gives you the strength of gravitational force. Mass - the amount of matter in an object. Weight - the force that acts upon an object. Weightlessness is due to a constant state of free-fall. Rotational momentum of a spinning or orbiting object is known as angular momentum. Angular momentum = mass * velocity * radius. Windmill converts the kinetic energy to electric energy. If you are at the top of roller coaster, you have the gravitational potential energy.
