俗话说“磨刀不误砍柴工”,这句话的物理道理何在?
人气:391 ℃ 时间:2020-05-27 12:47:00
解答
答:刀磨得越锋利,砍柴时刀刃与木材的接触面积越小,在用同样大小的力砍柴时,刀刃对木材的压强就越大,这样就可以将因磨刀而花费的时间补回来.
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