101013 - Physics 121 10/13/10 10/13/10 Physics 121 1...

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Physics 121 10/13/10 Prof. E. F. Redish 1 10/13/10 1 Physics 121 10/13/10 2 Physics 121 10/13/10 3 Physics 121 ± F A ± B = ² ± F B ± A ± a = ± F
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Physics 121 10/13/10 Prof. E. F. Redish 2 10/13/10 4 Physics 121 ± F A ± B where F is either N , T , f , or W 10/13/10 5 Physics 121 10/13/10 6 Physics 121 T T k 1 (large) k 2 (small) T = k ± s
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Physics 121 10/13/10 Prof. E. F. Redish 3 10/13/10 7 Physics 121 B A static AB B A B A N f f ± ± ± = ² μ max B A kinetic AB B A N f ± ± = static AB kinetic AB ± 10/13/10 8 Physics 121 ± 90- ± 90 opp adj hyp Although opp, adj, and hyp all depend on the size of the triangle, the ratios opp/adj, opp/hyp, and adj/hyp only depend on itsshape (that it, on ± ) . 10/13/10 9 Physics 121 ± 90- ± 9 0 opp adj hyp sin ± = opp hyp cos = adj hyp tan = opp adj Pythagorian theorem: adj (29 2 + opp 2 = hyp 2 or sin 2 + cos 2 = 1 Physics geometry heuristic : If you are drawing a diagram that is
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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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101013 - Physics 121 10/13/10 10/13/10 Physics 121 1...

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