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保守力.

Aug 09, 2008 陳 tinper3

W保=-U

保守力給物體的位能是從哪裡來的呢?

又我們知道如果只有保守力對物體作功則物體力學能守恆

也就是說

物體位能增加多少則動能就減少多少,反之亦然

所以由此可知保守力提供給物體的位能其實就是從物體本身的動能轉來的

這個觀念很簡單也很好用

如果能在判斷運動狀態時隨時注意這個觀念

就可以不去考慮之前困惑我的"保守力只能作功或提供位能(擇一)"

或是"去選定物體單一系統或者是地球+物體的系統" 的想法了

 

EX: 手將物體等速提升一段高度,因為手提供的力(非保守力)沒有給予物體動能,所以保守力(重力)根本沒辦法作功,位能也無從提供,所以外力+重力作功=0且物體位能=0

EX:一物體作自由落體運動,在這過程中保守力做功,將物體動能轉成位能,所以動能增加,位置能減少

 

只要保守力做了"某些事",物體的動能及位能一定會有所改變

之前所說的"保守力只能作功或提供位能(擇一)"並不是說保守力一但做功就位能=0了,不是!是我誤會他的意思了!

 

現在我找到了一個我可以接受而且又簡單的想法

 

 

 

 

 

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