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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
靜力平衡小疑惑 繩子長短的原因
Jul 27th 2013, 10:12

雖然只問C選項，還是要從A選項說起會比較清楚

(A)既然已經靜止了(即使沒有水平)，合力矩=0
力矩La=Lb

(b)因為質心離金屬線B比較近，力臂Db <Da
力矩La=Lb ，Da*Fa = Db*Fb
Db <Da ， Fb >Fa

(c) 因為Fb >Fa，金屬線B的伸長量>金屬線A的伸長量
最後等長，所以金屬線B的原長<金屬線A的原長

金屬線B原來比較短。

參考資料： KING TEACHER

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