100908 - Physics 121 9/8/10 9/8/10 1 1 cm + 4 cm 2 1 cm 3 +...

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Physics 121 9/8/10 Prof. E. F. Redish 1 9/8/10 1 4 ± 3 3 3 cm 5 cm 4 cm 1 = + ) (anythings 5 cm 4 cm 1 2 ± + ± ² 9/8/10 9/8/10 6
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Physics 121 9/8/10 Prof. E. F. Redish 2 9/8/10 7 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 8 9/8/10 9
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Physics 121 9/8/10 Prof. E. F. Redish 3 9/8/10 10 i ˆ i x r ˆ = ± i ˆ 9/8/10 11 9/8/10 12 i ˆ ± r = x ˆ i + y ˆ j ˆ j
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Physics 121 9/8/10 Prof. E. F. Redish 4 9/8/10 13 This is like the difference between position and length! 9/8/10 14 ± r t (29 = x ( t ) ˆ i + y ( t ) ˆ j x ( t ) ± ± r = ± r t 2 (29 ² ± r t 1 ± t = t 2 ² t 1 9/8/10 15 ±±± ±± ± ±±±± ±± rt rr tr t t rrr () () ()
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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 - Physics 121 9/8/10 9/8/10 1 1 cm + 4 cm 2 1 cm 3 +...

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