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機械能守恆定律動力學中的基本定律,即任何物體系統如無外力做功或外力做功之和為零,系統內又只有保守力(見勢能)做功時,則系統的機械能(動能與勢能之和)保持不變. 也就是在只有重力對物體做功的情况下,物體的動能和勢能發生相互轉化,但機械能的總量不變. 其數學運算式可以有以下兩種形式: E機o=E機t(或mgho+1/2m(v o)^2=mght+1/2m(v t)^2) [這種形式必須先確定重力勢能的參攷平面], △Ek=-△Ep.
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