101013-opp - 10/13/10 Physics 121 1 10/13/10 Physics 121 2...

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Unformatted text preview: 10/13/10 Physics 121 1 10/13/10 Physics 121 2 F net a= 10/13/10 Physics 121 FA B = FB A m 3 FA 10/13/10 B where F is either N , T , f , or W Physics 121 4 T =k s T T k1 (large) 10/13/10 k2 (small) Physics 121 6 max AB fA fA 10/13/10 B f B =μ kinetic AB =μ NA static AB B Physics 121 NA μ B kinetic AB μ static AB 7 90- 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 ) . hyp opp 90 adj 10/13/10 Physics 121 8 opp sin = hyp 90- hyp adj cos = hyp Pythagorian theorem: opp 9 0 opp tan = adj ( adj ) 2 + ( opp ) = ( hyp ) 2 2 or adj sin 2 + cos 2 = 1 Physics geometry heuristic: If you are drawing a diagram that is controlled by a single angle , and the rest of the lines are constructed as perpendiculars to the original or later lines, then the only angles in the diagram are , 90- , and 90 –- and it’s easy to tell which is which. 10/13/10 Physics 121 9 y block sliding down a ramp NR B y Wx x x Wy WE 10/13/10 Physics 121 B 10 NR B Wx ? Wy ? WE 10/13/10 B Physics 121 11 Start from rest Increase force until box starts moving Pull so it goes at a constant speed Graph: position net force 10/13/10 velocity acceleration applied force friction force Physics 121 12 10/13/10 Physics 121 13 ...
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101013-opp - 10/13/10 Physics 121 1 10/13/10 Physics 121 2...

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