100908-opp - 9/8/10 1 9/8/10 2 9/8/10 * You also won’t...

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Unformatted text preview: 9/8/10 1 9/8/10 2 9/8/10 * You also won’t get much partial credit on exams if you put numbers in too early since we may not be 3 able to tell what equations you are using and why! 1 cm + 4 cm 2 1 cm 3 + 4 cm 3 = 5 cm 3 9/8/10 4 5 (anythings) 1+ x r ( x ) = 20 2 x +1 9/8/10 5 9/8/10 6 Why choose this? –concepts of measurement, rate of change, force are fundamental –ties to everyday experience so can use and learn to build/refine intuition 9/8/10 7 9/8/10 8 9/8/10 9 ˆ i ˆ r = xi ˆ i 9/8/10 10 9/8/10 11 ˆj r = xi + yˆ ˆ j ˆ i 9/8/10 12 This is like the difference between position and length! 9/8/10 13 ˆ r ( t ) = x ( t )i + y ( t ) ˆ j x(t) r = r ( t 2 ) r ( t1 ) t = t2 9/8/10 t1 14 r ( t1 ) r ( t 2 ) r ( t 3 ) r12 = r (t 2 ) r (t1 ) r23 = r (t 3 ) r (t 2 ) r13 = r12 + r23 9/8/10 = r ( t 2 ) r ( t1 ) + r ( t 3 ) r ( t 2 ) = r ( t 3 ) r ( t1 ) 15 o o o o o Choose origin Choose axes Choose scale Set scales on graph Take data from video 9/8/10 16 displacement <v >= time it took to make the displacement r <v >= t 9/8/10 17 Position as a function of time 10 8 6 x (m) r <v >= = v0 t r = v0 t r ( t 2 ) r ( t1 ) = v 0 t r final = rinitial + v0 t 4 2 0 -5 0 5 10 15 t (sec) 9/8/10 18 ...
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This note was uploaded on 12/28/2011 for the course PHYSICS 121 taught by Professor Shawhan during the Spring '10 term at Maryland.

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100908-opp - 9/8/10 1 9/8/10 2 9/8/10 * You also won’t...

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