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範例:作功為零

下列何者作功為零?(A)人造衛星繞地球一週,萬有引力對衛星作功 (B)單擺之張力對擺錘作功 (C)單擺擺動,重力對擺錘作功 (D)斜向拋射某物體,自拋出至最高點,重力對物體作功 (E)物體繫於水平放置之彈簧上作S.H.M.,彈力對物體作功。

 

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Posted in 功與變力作功.

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By admin – 2009 年 03 月 24 日

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