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

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Unformatted text preview: 9/15/10 Physics 121 1 9/15/10 Physics 121 2 9/15/10 Physics 121 6 i ˆ ˆ r = xi 9/15/10 (where x is a length) Physics 121 7 r displacement v= = t time it took to do it Note: an instantaneous velocity goes with a specific time. dr v= dt 9/15/10 Note: an average velocity goes with a time interval. Physics 121 8 x (m) v (m) dx dt v t (sec) dx v (t ) = dt x (t + v (t ) = 9/15/10 t 2 ) x (t t Physics 121 t t ( sec) 2) 9 x (m) v (m) dx v dt t ( sec) dt dx = v(t ) dt sum (“ ”) in the changes in position over many small /15/10 time9intervals x= t ( sec) change in position over a small time interval dx = v(t ) dt Physics 121 10 9/15/10 Physics 121 11 9/15/10 Physics 121 12 slopes areas 9/15/10 Physics 121 x v= t x=v t 13 change in velocity <a>= time it took to make the change v <a>= t 9/15/10 Physics 121 14 9/15/10 Physics 121 15 dv a (t ) = dt v (t + a (t ) = 9/15/10 t 2 ) v (t t Physics 121 t 2) 16 a (m/s2) v (m/s) dv t (sec) a dt dv a (t ) = dt v(t + a (t ) = 9/15/10 t 2 ) v(t t Physics 121 t 2 t (sec) ) 17 2 a (m/s) v (m/s) a dv dt sum (“ ”) in the changes in velocity over many small time9intervals. /15/10 t (sec) dt dv = a (t ) dt v= t (sec) change in velocity over a small time interval dv = a (t ) dt Physics 121 18 ...
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100915-opp - 9/15/10 Physics 121 1 9/15/10 Physics 121 2...

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