Phys205A_Lecture7

Physics for Scientists & Engineers with Modern Physics (4th Edition)

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Lecture 7 Chapter 4 Motion in Two Dimensions Plan: Vectors for Position Velocity Acceleration 2D motion with constant acceleration
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Motion in Two Dimensions z Using + or – signs is not always sufficient to fully describe motion in more than one dimension z Vectors can be used to more fully describe motion z Will look at vector nature of quantities in more detail z Still interested in displacement, velocity, and acceleration z Will serve as the basis of multiple types of motion in future chapters
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General Motion Ideas z In two- or three-dimensional kinematics, everything is the same as as in one- dimensional motion except that we must now use full vector notation z Positive and negative signs are no longer sufficient to determine the direction
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Position and Displacement z The position of an object is described by its position vector, z The displacement of the object is defined as the change in its position z r r ∆≡ − rrr fi
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Average Velocity z The average velocity is the ratio of the displacement to the time interval for the displacement z The direction of the average velocity is the direction of the displacement vector z The average velocity between points is independent
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Phys205A_Lecture7 - Lecture 7 Chapter 4 Motion in Two...

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