101001-opp - 10/1/10 Physics 121 4 10/1/10 Physics 121 5...

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Unformatted text preview: 10/1/10 Physics 121 4 10/1/10 Physics 121 5 10/1/10 Physics 121 6 a= r = rf ri v = vf vi vx = v= r t v t x t vx t ax = 9/30/09 vy = ay = Physics 121 y t vy t If a is constant v= vi + v f 2 for either vx or vy. 9 F net a= 9/30/09 ax = net x F m Physics 121 ay = m Fynet m 10 9/29/10 Physics 121 11 ˆj i, ˆ r = xiˆ + yˆ j 9/29/10 Physics 121 12 r y r r1 r2 x r = r1 + r2 9/29/10 Physics 121 13 y r = r2 r1 = r2 + ( r1 ) r1 r2 x r1 r y r1 r = r2 r1 r2 = r1 + r r r2 9/29/10 x Physics 121 14 Geometry! Physics! Algebra! ˆ r1 = x1i + y1 ˆ j ˆ r =xi+y ˆ j 2 2 2 ˆ ˆ r1 + r2 = x1i + y1 ˆ + x2i + y2 ˆ j j ˆ ˆ = xi +x i +y ˆ+y ˆ j j 1 2 1 2 ˆ = ( x1 + x2 ) i + ( y1 + y2 ) ˆ j head to tail 9/29/10 parallelogram rule Physics 121 coordinates 15 block sliding down a hill y x 10/1/10 Physics 121 16 ...
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