物理名詞－－Conservative forces保守力

Physics for Scientists and Engineers with Modern Physics
John W. Jewett, Jr.
Raymond A. Serway
P.185

保守力Conservative forces：
構成系統的任二物體之間，它們相互作用的力若不會導致系統內力學能的移轉時，此力稱為保守力。

1.保守力對一物體作用時，其所做的功和物體移動所經過的路徑無關。

1.The work done by a conservative force on a particle moving between any two points is

independent of the path taken by the particle. 

2.保守力對一物體（質點）所做的功，當該物體移動的路徑為一封閉迴路時，所做的功為零。
2.Work done by a conservative force on a particle moving through any closed path is zero.  (Closed path: the beginning and ending points are the same.)