第163章 F等于ma

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    第163章F等于ma(第1/2页)
    2014年5月8日,学校,基础物理教室。
    教室在教学楼三楼,是一间普通的阶梯教室,能坐六十人,这节课来了五十三个,大一的学生,物理是必修课,不是他们的主业,大部分人是工科的,也有几个文科的,修了理科通识。
    林煜提前五分钟到,把一支粉笔放到粉笔槽里,翻开备课本,确认了一下今天的内容,然后把备课本合上,放到讲台一侧。
    学生陆续进来,找位置坐下,有人在说话,有人在看手机,有人翻出课本,有人什么都没有准备,就那样坐着等。
    没有人认识他。
    不是说没有听过他的名字,这个大学应用物理系的公告栏上贴过他的简历,简历上有他的学历、过往工作经历、发表过的主要论文,但那张纸贴在走廊里,没有多少人专门去看,即使看了,也不一定把那个名字和眼前这个人对上。
    他在这里只是一个新来的兼职老师,名字叫林煜,教大一物理,上午第三节课。
    铃声响了,他走到黑板前,拿起粉笔,在黑板正中间写下:
    F=ma
    他转过来,看了一眼台下,五十三张脸,有人已经在记,有人还在等他开口。
    “牛顿第二定律,“他说,“力等于质量乘以加速度。这是你们今天要掌握的最重要的一条。“
    有人低头翻课本,找到对应的页,在那行字下面划了线。
    他开始讲,从定义讲起,讲力,讲质量,讲加速度,讲这三个量之间的关系,讲单位,讲怎么用这个公式算一道题,他在黑板上写了一道例题,一步一步解,把每一步的逻辑说出来,不快,让每个人都跟得上。
    讲到一半,他问了一个问题,说如果一个物体受到两个方向的力,合力怎么算,台下有人举手,他叫了那个人,那个学生回答,回答得差不多对,有一个细节差了一点,他帮他补上去,说对,就是这样。
    那个学生坐下来,低头把那个补充记在本子上。
    他继续讲,讲完了例题,开始讲变式,讲这个公式在不同情境下怎么用,讲什么时候它成立,什么时候它有局限。
    讲了大概四十分钟,他停下来,说:“还有问题吗?“
    台下安静了几秒,然后靠前的一个学生举手,是个男生,头发有点乱,教材上有几处折角,是真的在看的那种折法。
    “老师,“他说,“这个公式在实际中怎么用?“
    林煜看着他,想了一下,说:“比如,你推一辆自行车。“
    那个学生有点意外,说:“自行车?“
    (本章未完,请点击下一页继续阅读)第163章F等于ma(第2/2页)
    “对,“林煜说,“你推一辆停着的自行车,你用的力是F,自行车的质量是m,它产生的加速度是a,F等于ma,这就是这个公式在实际中怎么用。“
    那个学生点了点头,在本子上写了什么。
    林煜看着他,继续说:“物理学里最重要的东西,往往是最简单的东西,这个公式能解释的事情,你每天都在做,推门,拎包,骑车,迈步,都在里面。“
    台下的几个人抬起头,好像这句话让他们重新看了一眼那黑板上的三个字母。
    下课铃响了,学生开始收拾东西,有人站起来,有人还在写,有几个在小声讨论什么。
    林煜把备课本拿起来,往讲台下走,经过前排,那个举手问问题的学生看了他一眼,说:“老师,谢谢。“
    他说:“嗯。“
    走出教室,走廊里有学生来来往往,他往楼梯那边走,下了楼,出了楼,外面是校园,五月的南方,湿的,绿的,空气里有某种开了的花的气味,他不认识那是什么花,只是闻到了。
    他在校园里走了一段,往停车棚走,找到他的自行车,解了锁,骑上去,往院子的方向走。
    路上经过那段沿江的柳树,叶子已经完全展开了,比四月初他到的时候更绿,更密,风来,整片地轻微地摆,他骑过去,风从两侧来,把衬衫吹起一点,然后放下。
    他想着刚才那节课。
    F等于ma,他在大一的时候就知道这个,他在大一的时候已经在做比这复杂很多倍的东西,那个时候他觉得这是起点,是往上走之前站的那个地方,站完了就离开,不再回头。
    今天他把它写在黑板上,讲了四十分钟,讲完了,有个学生说谢谢,那声谢谢是因为他听懂了,不是因为他觉得这了不起,就是听懂了,谢谢。
    林煜骑着车,想了想那声谢谢。
    他以前做的那些事,那些发现,那些算法,那些论文——他不是没有从里面得到过满足,但那种满足是别的东西,是推到终点的满足,是突破的满足,不是这种。
    这种满足很小,就是一个人本来不懂,现在懂了,就这样。
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