【正文】
?? ??121222 2121 mghmvmghmvEEE ???? 12當(dāng) WG外 > 0時(shí),△ E> 0,機(jī)械能增加 當(dāng) WG外 < 0時(shí),△ E< 0,機(jī)械能減少 ? ? ? ?1122 pkpk EEEE ???? 12 EEEG ????外w除重力 (彈力 )外,其他外力對(duì)物體對(duì)所做的總功 WG外 等于物體機(jī)械能的變化量△ E 功 能 原 理 謝謝觀看 /歡迎下載 BY FAITH I MEAN A VISION OF GOOD ONE CHERISHES AND THE ENTHUSIASM THAT PUSHES ONE TO SEEK ITS FULFILLMENT REGARDLESS OF OBSTACLES. BY FAITH I BY FAITH