Lecture_3_(Student_Handout)

# Lecture_3_(Student_Handout) - PHYS 172 Modern Mechanics...

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1 Summer 2009 PHYS 172: Modern Mechanics Lecture 3 – Momentum and The Momentum Principle Read 2.1-2.5 Velocity As a Measure of Motion Today: The Momentum Principle Forces and The Momentum Principle Momentum As a Measure of Motion Changes in Momentum

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2 Summary of 4 Vectors We’ve Seen So Far 1. Displacement vectors Represents the movement of an object from one point to another 2. Position vectors Represents the position of an object (is defined as the displacement vector stretching from an origin to the point of interest) 3. Relative position vectors (aka separation vectors) The vector which points from location 1 toward location 2 r r 12 r 4. Average velocity vectors The vector that gives an object’s displacement in a given time CLICKER QUESTION #1 - 3: READING QUESTION (This is a closed-book quiz, no consulting with neighbors, etc.)
3 0 lim t r dr v t dt   Last Time: Instantaneous Velocity Note that the instantaneous velocity vector is TANGENT to the trajectory

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Lecture_3_(Student_Handout) - PHYS 172 Modern Mechanics...

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