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	"title":"扫把只有今天能“立正”？物理老师：哪天都能",
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	"publishtime":"2020-02-11 21:20:00",
	"source":"鞍报全媒",
	"author":"沈璐佳 ",
	"editor":"费文鹏",
	"liability":"李识金",
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	"content":"<p style=\"text-align: center; text-indent: 0em;\"><img style=\"max-width:100%;\" src=\"https://asyoss.newaircloud.com/asy/pic/202002/11/7df27f05-066b-47df-81d0-5aef92304840.jpg\" _src=\"https://asyoss.newaircloud.com/asy/pic/202002/11/7df27f05-066b-47df-81d0-5aef92304840.jpg\" nac_w=\"1080\" nac_h=\"1440\"></p><p>11日晚，朋友圈里盛行一个“立扫把”的游戏，说今天是地球完美的重力角度，是唯一一天可以把扫把立起来的日子。很多小朋友为此一试，得到的结果大多是“哇，真的可以！”然而事实上到底有没有这么玄幻？记者第一时间找到了46中的物理老师徐永玲进行了“揭秘”。</p><p style=\"text-align: center; text-indent: 0em;\"><img style=\"max-width:100%;\" src=\"https://asyoss.newaircloud.com/asy/pic/202002/11/6ed671ad-9cdc-46e7-af78-e97a1158d522.jpg\" _src=\"https://asyoss.newaircloud.com/asy/pic/202002/11/6ed671ad-9cdc-46e7-af78-e97a1158d522.jpg\" nac_w=\"1080\" nac_h=\"1034\"></p><p><br></p><p>46中的物理老师徐永玲说，其实扫把能立起来 ，跟哪天没啥关系，今天可以，明天也可以。其实这是一个很简单的物理现象。</p><p>那么是什么让扫帚直立呢？徐永玲老师说，其实这个问题很简单，“因为任何东西倒下，原因都是重心没有支撑，只要重心有支撑，一切问题就迎刃而解。所以，所谓的扫帚挑战，其实只是考验你寻找重心的能力和耐心。”许老师进一步解释说，因为扫帚的重心比扫帚柄的高点更靠近底部扫帚毛。 你可以试着把扫帚水平地放在手指上，就好像跷跷板一样，以此来测试扫帚的重心。所以当你把扫帚毛劈开，重心自然就在距离底部很近的地方，并不难找到一个稳定的点。如果扫帚是新的，扫帚毛又直又硬，想要支撑这个重心就更简单了。</p>",
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