動能定理，機(jī)械能守恒定律應(yīng)用

電子通信論文編號:TX189  論文字?jǐn)?shù):11214,頁數(shù):29

目錄
1引言 1
2參考系 2
2.1參考系的定義 2
2.2參考系的分類 2
2.2.1慣性參考系和非慣性參考系 2
2.2.2牛頓運(yùn)動定律只適用于慣性系 3
3動能定理與參考系 4
3.1動能定理的推導(dǎo) 4
3.2動能定理的內(nèi)容及意義 6
3.2.1內(nèi)容 6
3.2.2意義 6
3.3 動能定理與參考系 7
3.3.1功與參考系 7
3.3.2動能與參考系 10
4機(jī)械能守恒定律與參考系 12
4.1機(jī)械能守恒定律的推導(dǎo) 12
4.2機(jī)械能守恒定律的內(nèi)容及意義 13
4.3機(jī)械能守恒定律與參考系 13
5結(jié)論 16
參考文獻(xiàn) 17
致謝 18

摘 要

參考系是用來描述物體運(yùn)動而選作標(biāo)準(zhǔn)的另外的物體。同一運(yùn)動，相對于不同的參考系有不同的描述。在動能定理和機(jī)械能守恒定律中，選擇不同的參考系，其外力做功或動能就不同，從而影響定理或定律的成立或計(jì)算的繁簡程度。因此，在運(yùn)用動能定理或機(jī)械能守恒定律時(shí)，選擇參考系的一般原則是選慣性參考系并力求簡單方便。

關(guān)鍵詞：動能定理；機(jī)械能守恒定律；參考系

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