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滑輪,一名鹿盧,機械也。輪有槽,環樞而動,索在輪上,負荷牽曳以為工器者也。分定、動、組合:定滑輪,中樞不動者也;動滑輪,隨物偕動者也;至於定動協合,以節功力者,謂之滑輪組。
一、索在定滑輪左下者之引力與索在定滑輪右下者之引力同。
二、索在動滑輪左上抑右上者之引力為所負物重之半。
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