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範例:非固定的鉛直面圓周運動[88日大]

一擺長為R的單擺懸於牆上O點。在O點的正下方距離H處(H小於R)有一水平細桿O',細桿垂直進入牆面。今拉擺錘至擺線呈水平後放開(如圖所示),若要擺錘在細桿擋住擺線後,仍能繞細桿作完整的圓周運動,則H/R的最小比值應為(A)1/2 (B)3/5 (C)2/3 (D)3/4 (E)4/5[88日大]

https://youtu.be/eVPtRBfHayw

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Posted in 歷屆物理考題, 重力位能.

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