下列哪一情況，力對物體作功不為零 (A)單擺運動中，繩子的張力所做的功 (B)單擺運動中，重力所做的功 (C)物體沿斜面下滑，正向力所做的功 (D)等速度運動的物體，合力所做的功。

問題詳情

5.下列哪一情況，力對物體作功不為零
(A)單擺運動中，繩子的張力所做的功
(B)單擺運動中，重力所做的功
(C)物體沿斜面下滑，正向力所做的功
(D)等速度運動的物體，合力所做的功。

參考答案

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