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範例 18:工人拉船
碼頭上,有一個圓筒狀鐵柱,從船上拋出一根繩子,一端固定在船尾,另一端繞鐵柱三圈後由一工人拉著,假設工人施力10公斤,繩子與鐵柱的磨擦係數是1/3,請問船尾受力多大?
《 解答 》
width=285
在繩子與鐵柱有 width=19 的接觸時,拉力 width=14 會提供 width=34(接近 width=73)的正壓力給鐵柱,所以有 ,積分得 ,其中 width=18 就是10公斤,,而 ,所以

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