如:Aab=mg(2a-26)=-(Epb-Epa) Ab=Gm(-)=-(E6-E) Aab= ,2- 2=-(E6-Ea) 重力势能 26=0 Ep6=0 E。=mg GMm 引力势能 6=00 E6=0E。= 弹性势能 x6=0 E=0E。=5kx2 b = Ez pb = 0 0 弹性势能 重力势能 引力势能 0 b = ∞ Er pb = b = Ex pb = 0 0 p = mgzE r GMm Ep −= 2 p 2 1 = kxE )()( ab = − ba = − − EEzzmgA pp ab )( 21 21 pp 2 2 ab a b −−=−= EEkxkxA ab )() 11( pp ab ab ab EE rr = GMmA −−=− 如: