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範例:等速率圓周運動-向心力

如右圖中,三個乾冰盤A,BC,其質量均為m,用三條長度均為L的細繩接A,B,C順序由內向外連接之,一端固定,O為中心在水平面上做等速率圓周運動,最靠內面的A圓盤速率為v, (A)A,B,C三者的角速率相等。(B)圓盤B的向心力為2mv2/L (C)A,B,C三個圓盤的向心力比為1:4:9 (D)連接B,C兩圓盤之細繩的張力為4mv2/L (E)連接A,B兩圓盤之細繩張力為5mv2/L84 華江】

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