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Lecture 8

Lecture 8 - Today Physics 231 General University Physics...

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Physics 231 General University Physics Spring 2007 Lecture 8 Today Newton’s I and II Laws First Law Inertia Second Law Force Mass Preamble Demo: slide objects It stops because of friction Imagine removing friction (puck on ice) Demo: drop sheet of paper Air resistance Imagine removing air resistance Demo Galileo Inclined ramp Make horizontal Demo: Bowling Ball on Horizontal Ramp Demo (reminder): puck on air hockey table LD (reminder): (CC1A22) moving puck Natural state is motion at constant velocity Newton’s First Law A object that is at rest will remain at rest and an object that is moving will continue to move with uniform motion if and only if there is no net interaction with the environment. Uniform motion is a motion in a straight line with constant speed. No net interaction? For example Make surface level Neglect friction Credit Galileo (vs. Aristotle); Newton added framework Demo Ball rolling within horizontal circular ring with a gap What happens when the ball reaches the gap? Uniform motion

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