問題詳情
32. 甲、乙、丙、丁四個木塊的質量均為 2 kg，分別置於不同的水平桌面上，並對木塊施以兩個方向相反的水平力，如圖。若四個木塊均維持靜止，則此時哪一個木塊所受摩擦力為 2 N 方向向左？(N 為牛頓，是力的單位)
(A)甲
(B)乙
(C)丙
(D)丁
參考答案
無參考答案
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