問題詳情
1.【圖 1】中有五塊相同的磚堆疊起來，頂端的第二塊以不可伸縮的繩索水平固定於牆上，每塊磚重量為0.4 kg，各接觸界面之靜摩擦係數皆為 0.2，P 的力量需要多大才可拉動最底下那塊磚？
(A) 5.49 N
(B)3.92N
(C)2.35N
(D)1.57N 
參考答案
無參考答案
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