To use respectively that rigid body plane differential equations of motion, theorem of angular momentum, conservation law of mechanical energy, and the law of conservation of energy.
从时间的均匀性可推得机械能守恒定律，从空间的均匀性和空间的各向同性可分别推出动量守恒定律和角动量守恒定律。
In the paper, various forms of theorem of angular momentum are summarized and the foundation of their proof and the relations between them are also illustrated.
本文综述各种形式的动量矩定理，说明证明的依据和相互联系。
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