As to the conservationofmotion of center of mass, the method of absolute coordinate system is generally used in the teaching meterials of theoretic mechanics.
对于质心运动守恒问题,理论力学教材中一般用绝对坐标法进行计算。
2
Turns out, some of these equations were very familiar: the law ofconservationof momentum, and Newton's second law of motion.
其结果,其中一些方程非常眼熟,比如动量守恒定律和牛顿第二定律。
3
He is adamant that this is not a perpetual motion machine, and does not violate the law ofconservation of momentum because different reference frames apply to the drive and the waves within it.