Physics 121 10/15/10 Prof. E. F. Redish 1 10/15/10 1 Physics 121 10/15/10 2 Physics 121 10/15/10 3 Physics 121 T T k1 (large) k2 (small)Physics 121 10/15/10 Prof. E. F. Redish 2 10/15/10 4 Physics 121 T T k1 (large) k2 (small) T = keffs? T T T T T = k1s1T = k2s2s = s1+ s2Tkeff=Tk1+Tk21keff=1k1+1k210/15/10 12 Physics 121 10/15/10 13 Physics 121 vmtF==IPhysics 121 10/15/10 Prof. E. F. Redish 3 10/15/10 14 Physics 121 vmp= Fnet= mvt= ma Fnet= mv()t=pt10/15/10 15 Physics 121 tFnetnet=Inetp I=a =Fnetmvt=Fnetmm v =Fnett10/15/10 16 Physics 121 tFFvmtFFvmBAextBBBABextAAA+=+=)()( mAvA+ mBvB=FAext+FBext+FA B+FB A() t mAvA+ mBvB()=FexttPhysics 121 10/15/10 Prof. E. F. Redish 4 10/15/10 17 Physics 121 ()fBBfAAiBBiAABBAAvmvmvmvmvmvm+=+=+ 010/15/10 18 Physics 121 (object goes backwards) Do
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