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廣義位勢

拉格朗日力學時常涉及廣義位勢,因為拉格朗日量的廣義式定義包含了廣義位勢:

其中,是廣義位勢,動能

定義廣義位勢為一個函數

滿足下述與廣義力的關係:

其中,廣義坐標廣義速度時間

假若一個物理系統滿足上述關係,此系統是單演系統

假若一個單演系統的廣義位勢只跟廣義坐標有關,,則此系統是保守系統。廣義力與廣義位勢的關係是

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廣義位勢
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