用隔离法列方程:(以逆时针方向为正) B A M LL-B B B g Bg TI B m4g-T=ma T2-mBg J=J +J=lMr2+mar2用隔离法列方程：（以逆时针方向为正） o x1 x2 s A M B A B r x m CA CB T1 J T2 r . CA T1 mAg C . B T2 mBg M A o B mA g −T1 = mA a T2 − mB g = mB a T1 r −T2 r = Jβ 2 AB 2 M AB Mr m r 2 1 J = J + J = +