ASTR 3 Lecture Notes - Lecture 6: Angular Momentum, Momentum, Conservation Law
Document Summary
Gravity accelerates everything at the same weight regardless of weight. Momentum and force (linear) momentum= mass x velocity (p=mv) Newton found that a net force changes momentum. Mass is usually constant, so this means an acceleration (because of a change in the velocity part of mv) Mass- the amount of matter in an object. Weight- the force that acts upon an object. When gravity is the only force acting you are said to be in free- fall . Realized that the same physical laws that operate on earth also operate in outer space. First law of motion: an object moves at constant velocity unless a net force acts to. Motion at constant speed is the normal state. Second law of motion: force= mass x acceleration. A larger mass needs a greater force to achieve the same acceleration. Third law of motion: for every force, there is always an equal and opposite reaction force.
