动能定理的应用分析

通过对动能定理、功能原理和机械能守恒定律的简明推导，总结出动能定理、功能原理和机械能守恒定律三者之间的相互关系及各自的应用条件。重点阐述了动能定理与机械能守恒定律应用的区别。

Analyse the use of kinetic energy theorem

Through concise short derivation of kinetic energy theorem, work energy theory and principle of conservation of mechanical energy, we summarized relationship and use condition of kinetic energy theorem, work energy theory and principle of conservation of mechanical energy. Explained the difference between kinetic energy theorem and work energy theory in use.