conservation law of mechanical energy

The conservation law of mechanical energy in variable mass mechanical systems with ideal bilateral holonomic constraints is studied.

研究具有双面理想完整约束的变质量力学系统的机械能守恒律。

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。

It is explained that the law of conservation of mechanical energy obeys relativity principle of mechanics.

系统地阐明机械能守恒定律无条件服从力学相对性原理。