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第385章 常数(2 / 2)

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会。

用科学的解释就是普通轮胎和路面之间怎么样都会有空隙,为了保证汽车的抓地力,修路不能修光滑,轮胎也不能做光滑。

但火车就没这个问题了,火车轮子的凹槽保证了这东西根本不需要什么抓地力,本身失控也失不到哪里去,而铁轨就可以做到光滑,铁制的轮子也可以光滑,光滑的两面产生的摩擦力就很小了。

但试图和一个封建君主讲明白摩擦力的基本原理……祝青萝选择不费那劲,讲现象就完了。

她转身去工作台的零件柜里寻找,很快拿摸了个弹簧测力计回来:“陛下,这是个用来测力量大小的东西,中间的那根弯曲的铁丝我将它称为弹簧,使用的力量越大,弹簧就会被拉得越长,一旦松手,弹簧就会恢复原状。”

她还当着徐影的面实验了一下,随后才把弹簧测力计交给徐影:“陛下自己试试?”

徐影拿着那个测力计,有些新奇。

中原的大多数书籍和记录对数字其实不会特别敏感,三千尺,九千丈,重于泰山,轻于鸿毛,大多数时候张口就来,对长度和数量那是比较直观的东西,让普通人还能有些概念,对力量就只能大概分一下“大”和“小”了,算起来,这还是徐影第一次见到可以测力的机器。

所以徐影都玩了一会儿,感受了科学的神奇,完了还问祝青萝:“先生既然连机器都做出来了,论长度有尺寸,论重量有斤两,却不知道力量要怎么算法?”

祝青萝其实愣了一下的。

中原的历史都拐弯了,也不知道牛顿还会不会正常出生,但爱出生不出生,反正现在中原……甚至是全地球都还没有一个力量计量单位。

祝青萝一时间都有了点把牛顿篡改了,从此表示力量的单位用“一祝”的冲动。

……忍了忍了,要脸要脸。

但如果不用祝青萝知识体系里的“牛”,既然要脸也不可能随便找个标准把“牛”篡改成“祝”,祝青萝顺便想起了那个不是整数但原本可以是整数的“9.8N/kg”……

祝青萝笑道:“如无必要,不增实体,其实力量和斤两之间也有些关系,简单地以不用其他工具,提起一斤的水需要多少力量作为测量力的‘斤两’和‘尺寸’,不就好了么?”

至于说重力常数修改之后其他的常数也得跟着变动……那就是后人要考虑的事情了嘛。

物理又不比数学的抽象,数学里不完美且能应用到生活的无理数数都数得出来就那么几个,可物理就没几个正常的常数,现代社会物理体系那些不正常的常数能用,那怎么就不能让东方人来定义常数是多少呢?

想一想如果中原的物理学如果能走在西方前面,各种常数都是以东方标准为准,祝青萝脸上都起来了一层叫做民族自豪感的红晕。

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