滑輪組是吊鉤組配合工作的固定滑輪

，固定於結構上
，由若幹個定滑輪和動滑輪組合而成，它既可以省力又可以改變力作用方向。動滑輪的特點是：shiyongqinengshengyibanli，danshifeijuli。yinweishiyongdonghualunshi，goumayouliangduanshengzidiaozhe
，meiduanshengzizhichengdangoumazhongdeyiban。shiyongdonghualunsuiranshengleli，danshidongliyidongdejulishigoumashenggaodejulideliangbei，suoyifeilejuli。bunenggaibianlidefangxiang。suizhewutideyidongeryidong。 定滑輪的**軸固定不動，定ding滑hua輪lun的de功gong能neng是shi改gai變bian力li的de方fang向xiang。當dang牽qian拉la重zhong物wu時shi
，可ke使shi用yong定ding滑hua輪lun將jiang施shi力li方fang向xiang轉zhuan變bian為wei容rong易yi出chu力li的de方fang向xiang。使shi用yong定ding滑hua輪lun時shi，施shi力li牽qian拉la的de距ju離li等deng於yu物wu體ti上shang升sheng的de距ju離li，不bu能neng省sheng力li也ye不bu費fei力li。繩sheng索suo兩liang端duan的de拉la力li相xiang等deng
，所suo以yi，輸shu出chu力li等deng與yu輸shu入ru力li，定ding滑hua輪lun的de機ji械xie利li益yi等deng於yu1。