动能定理，机械能守恒定律应用

文档编号:TX189  文档字数:11214,页数:29

摘 要

参考系是用来描述物体运动而选作标准的另外的物体。同一运动，相对于不同的参考系有不同的描述。在动能定理和机械能守恒定律中，选择不同的参考系，其外力做功或动能就不同，从而影响定理或定律的成立或计算的繁简程度。因此，在运用动能定理或机械能守恒定律时，选择参考系的一般原则是选惯性参考系并力求简单方便。

关键词：动能定理；机械能守恒定律；参考系

Abstract

The reference system is used to describe the movements of objects as a standard for other objects. To the same movement, different reference systems have different descriptions. Due to select different reference systems, external force acting or the kinetic energy of an object is different in the kinetic energy theorem and the mechanical energy conservation relations. Thus the establishment of theorem or law or the degree of computation is influenced. Therefore, in general principle, the selection reference system is the inertia system, simply and convenient in the application of kinetic energy theorem or mechanical energy conservation relations.
Key words: theorem of kinetic energy; conservation law of mechanical energy;  reference frame

目录
1引言 1
2参考系 2
2.1参考系的定义 2
2.2参考系的分类 2
2.2.1惯性参考系和非惯性参考系 2
2.2.2牛顿运动定律只适用于惯性系 3
3动能定理与参考系 4
3.1动能定理的推导 4
3.2动能定理的内容及意义 6
3.2.1内容 6
3.2.2意义 6
3.3 动能定理与参考系 7
3.3.1功与参考系 7
3.3.2动能与参考系 10
4机械能守恒定律与参考系 12
4.1机械能守恒定律的推导 12
4.2机械能守恒定律的内容及意义 13
4.3机械能守恒定律与参考系 13
5结论 16
参考文献 17
致谢 18

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