# 100915 - Physics 121 Physics 121 1 Physics 121 2 Physics...

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Physics 121 9/15/10 Prof. E. F. Redish 1 9/15/10 1 Physics 121 9/15/10 2 Physics 121 9/15/10 6 Physics 121

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Physics 121 9/15/10 Prof. E. F. Redish 2 9/15/10 7 Physics 121 ± i ± i x r ˆ ˆ = (where x is a length) 9/15/10 8 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 a specific time . 9/15/10 9 Physics 121 vt dx dt xt t tt () = = + ±± ²² ² 22 t (sec) x (m) t (sec) v (m) dx dt v
Physics 121 9/15/10 Prof. E. F. Redish 3 10 Physics 121 t (sec) x (m) t (sec) v (m) dt v dt dx ± ² = = = dt t v dx x dt t v dx ) ( ) ( change in position over a small time interval sum (“ ± ”) in the changes in position over many small time intervals 9/15/10 11 Physics 121 9/15/10 12 Physics 121

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Physics 121 9/15/10
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100915 - Physics 121 Physics 121 1 Physics 121 2 Physics...

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