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Lecture03.MomentumPrinciple.Ch2 (1)

# Lecture03.MomentumPrinciple.Ch2 (1) - PHYS 172 Modern...

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Fall 2010 PHYS 172: Modern Mechanics Lecture 3 - The Momentum Principle Read 2.1-2.6 Course Website: Everything you need http://www.physics.purdue.edu/academic_programs/courses/phys172/

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TODAY •Relativity •Momentum Principle •Impulse •Net Force •Predicting Motion
RELATIVITY “Physical laws work in the same way for observers in uniform motion as for observers at rest.” The position update formula (=in all inertial reference frames)

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RELATIVITY “Physical laws work in the same way for observers in uniform motion as for observers at rest.” The position update formula (=in all inertial reference frames) Note: all parameters must be measured in respect to the selected reference frame to predict motion in respect to that reference frame
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The Momentum Principle An object moves in a straight line and at constant speed except to the extent that it interacts with other objects The Momentum Principle Change of momentum is equal to the net force acting on an object times the duration of the interaction • Assume that F does not change during Δ t What is “force” F ?
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Lecture03.MomentumPrinciple.Ch2 (1) - PHYS 172 Modern...

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