ASTR-1010 Lecture 2: Exam #2 Study Guide
20 Oct 2016
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Chapter 4 - making sense of the universe. Speed: how far something will go in a certain amount of time. Acceleration: change in speed or direction, or both. Acceleration of gravity: acceleration of a falling object. On earth, the acceleration of gravity is about 10 meters per second squared. The only way to change an object"s momentum is to add a force to it. Net force: the combined effect of all the individual forces put together. Torque: type of force that can change an object"s angular momentum. Mass: the amount of matter in your body. Weight: the force that a scale measures when you stand on it; weight depends both on your mass and on the forces acting on your mass. Free-fall: falling without any resistance to slow you down. Astronauts are weightless the entire time they orbit earth because they are in a constant state of freefall.
