Closed System Energy Balances Total energy Total energy Change in the total entering the system energy of the system En-Eout=△Esystem 1st law (Qin-Cou)+(Win -Wou) AE=E2-E,=△U+AKE+APE Only two types of interactions are =m(4-4)+与m(c-c)+mg(2-21) possible between a closed system and its surroundings Surroundings System W 上降文通大学 March 7,2019 2 SHANGHAI JIAO TONG UNIVERSITYMarch 7, 2019 2 Closed System Energy Balances 2 1 2 2 2 1 2 1 2 1 KE PE 1 ( ) ( ) ( ) 2 E E E U m u u m c c mg z z          Only two types of interactions are       possible between a closed system and its surroundings 1 st law