ASTR 170B1 Lecture Notes - Lecture 4: Central Force, Edmond Halley, Angular Momentum
30 Sep 2016
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Chapter 4 - making sense of the universe: understanding motion, energy, and gravity. A car moving at 60 miles per hour due east. Acceleration: change in speed or direction of motion (or both). Force: interaction that changes the motion of an object. A net force is the sum of all forces acting on a body. He discovered laws of motion and gravitation. He realized these same laws of physics were identical in the universe and on earth. A true genius; in his early 20s. Published in 1687 with help from edmund halley. Presents his 3 laws of motion and his law of gravity. Still basic concepts used in modern physics and astronomy. An object moves at constant velocity unless a net force acts to change its speed or direction. Based on galileo"s ideas about inertia and motion. A body remains at rest or moves in a straight line at a constant speed unless acted upon by an outside (net) force.
