[新聞] 南大面試題刁鑽:火車為何先退後再前進
http://news.sohu.com/20110314/n279803229.shtml
揚州中學考生邱晨:退一步是為了更好地前進,這是一種以退為進的最佳選擇。
在採訪了物理老師之後,得出的結論是:
通常情況下,火車各節車廂之
間的掛鉤拉得很緊,牽引力必須克服整列火車與鐵軌的最大靜摩擦力才能啟動。只有盡
量減小這種摩擦力對啟動的影響,才能使火車順利地開出車站。火車先倒車,就是為了使
車廂間掛鉤鬆弛,再向前啟動,使車廂逐節啟動。
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※ 編輯: Coldfengzi 來自: 116.232.146.196 (03/25 20:43)
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