PHYS111 Lecture Notes - Lecture 3: Net Force
3 Apr 2014
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If no forces act on an object, it continues in its original state of motion; that is, unless something exerts an external force on it. An object at rest remains at rest, and an object with a velocity, keeps that velocity: the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. If two objects interact, the force f12 exerted by object 1 on object 2 is equal in magnitude but opposite in direction to the force f21 exerted by object 2 on object 1. Mutal force attraction between any two objects of m1 & m2. G- universal gravitation force r- distance between m1 & m2. *weight is not an inert property of an object, mass is. F= mg + n = 0 n= -mg.
