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Lecture 3

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PHYS 111
Joseph Sanderson

FORCES (week 3) Newton’s Three Laws 1. 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. 2. The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. 3. 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. Inertia - the tendancy of an object to continue in its original motion - it is quantitative Mass - a measure of the resistance of an object to change its motion due to
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