機械_工程力學 - 考試

By Ingrid
at 2013-10-03T19:13
at 2013-10-03T19:13
Table of Contents
題目出處為93土木地特四等
題目和參考書解法http://ppt.cc/xr1W
http://ppt.cc/2Mfq
這題可用虛功法和最小功能原理來解
我有問題的地方如連結中圖片紅色圈選處
1. 為何彈簧的虛功是負的?
2. 最小功能原理,重力位能Vp為何是負的?
其實我對這兩個章節正負號的判斷搞不清楚
可否另外請教大家遇到這類題型時判斷正負號的依據?
感謝各位板友
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