# 100913 - Physics 121 2003 Fall Physics 121 1 Physics 121 2...

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Physics 121 Fall 2003 9/13/10 Prof. E. F. Redish 1 9/13/10 1 Physics 121 9/13/10 2 Physics 121 Velocity as a function of time 0 0.5 1 1.5 2 -5 0 5 10 15 t (sec) x (m) Position as a function of time 0 2 4 6 8 10 -5 0 5 10 15 t (sec) v = ± x ± t ± x = v ± t ± x ± t Slope = < v > v (m/s)

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Physics 121 Fall 2003 9/13/10 Prof. E. F. Redish 2 9/11/09 7 Physics 121 9/13/10 12 Physics 121 9/13/10 13 Physics 121 ± i ± i x r ˆ ˆ = (where x is a length)
Physics 121 Fall 2003 9/13/10 Prof. E. F. Redish 3 9/13/10 14 Physics 121 ± it do it took to time nt displaceme = ± ± = t r v ± ± dt r d v ± ± = Note: an average velocity goes with a time interval . Note: an instantaneous velocity goes with

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100913 - Physics 121 2003 Fall Physics 121 1 Physics 121 2...

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