[問題] 摩擦力
減少摩擦力的方式 :
利用滾珠軸承設計,將固體間的接觸方式由滑動轉變成滾動
例如 : 腳踏車輪的軸承
問題 :
為什麼滾動的摩擦力會比滑動的摩擦力小 ?
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※ 編輯: Yistevia (59.120.177.253), 05/13/2016 21:32:51
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