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Unformatted text preview: 1 / 10 Physics 111 Lecture 3a Any intelligent fool can make things bigger, more complex, and more violent. It takes a lot of courage to move in the opposite direction. Albert Einstein 2D Variables 2D Variables Questions Relative velocity Relativity 2 / 10 Motion on a flat surface (2D motion) is described by way of vectors Position will be denoted by vector r Displacement will be denoted by vector r = vector r f vector r i (see figure) Note that the position depends on where you choose the origin, while displacement does not The average speed is again defined as (scalar) speed avg = distance time (1) Average velocity is again the total displacement over the time interval vectorv avg = vector r t = vector r f vector r i t (2) 2D Variables 2D Variables Questions Relative velocity Relativity 3 / 10 Example: A woman drives 100 km south in 1 hour and 200 km west in an additional 3 hours. What are her average speed and average velocity for the four hours?...
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This note was uploaded on 04/22/2008 for the course PHYS 111 taught by Professor Madrid during the Winter '08 term at Ohio State.
 Winter '08
 Madrid
 Physics

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