Physics 121 9/29/10 Prof. E. F. Redish 1 9/29/10 1 Physics 121 9/29/10 3 Physics 121 3.1 3.2 3.3 3.4 a 2% 1% 1% 0% b 4% 4% 93% 14% c 17% 20% 3% 63% d 2% 69% 3% 0% e 68% 6% 1% 18% ae 1% 0% 0% 0% be 0% 0% 0% 4% ce 7% 0% 0% 0% 9/30/09 9 Physics 121 ax=Fxnetmay=Fynetm a =FnetmPhysics 121 9/29/10 Prof. E. F. Redish 2 9/30/09 10 Physics 121 v=rtr =rfria=vtv =vfvivx=xtvy=ytax=vxtay=vytIf a is constant 2fivvv+=for either vx or vy. 9/29/10 11 Physics 121 9/29/10 12 Physics 121 ˆi, ˆj r = xˆi + yˆjPhysics 121 9/29/10 Prof. E. F. Redish 3 9/29/10 13 Physics 121 r r =r1+r2 r1 r2rx y 9/29/10 14 Physics 121 r =r2r1r2=r1+ r r r =r2r1=r2+ (r1) r1r2x y r1x r2y r1r9/29/10 15 Physics 121 head parallelogram coordinates to tail rule Physics! Geometry! Algebra! r1= x1ˆi + y1ˆjr2= x2ˆi + y2ˆjr1+r2= x1ˆi + y1ˆj + x2ˆi + y2ˆj= x1ˆi + x2ˆi + y1ˆj + y2ˆj= x1+ x2()ˆi + y1+
View Full Document