二、讲授新课： 11.1 伽利略变换式 牛顿的时空观 一、伽利略变换 1 力学相对性原理(Principle of relativity in mechanics) 一切力学规律在不同的惯性系中有相同的形式。称为牛顿相对性原理或力学 相对性原理，也叫做伽利略不变性。
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It follows from the principle of relativity that Newton's second law of motion, although fundamental in classical mechanics, only has an approximate and by no means complete validity.
由相对论原理可知，牛顿运动第二定律尽管是古典力学中的基本原理，但只是近似的，而绝不是完全正确的。
It follows from the principle of relativity that Newton's second law of motion although fundamental in classical mechanics only has an approximate and by no means complete validity.
由相对论原理可知，牛顿运动第二定律尽管是古典力学中的基本原理，但只是近似的，而决不是完全正确的。
In this paper it is explained that the law of conservation of mechanical energy must Obey the relativity principle of mechanics.
文章系统地阐明了机械能守恒定律无条件服从力学相对性原理，若总机械能在一个惯性系守恒，它就在所有惯性系守恒。
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