第二十章:笔记本的升华
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第二十章:笔记本的升华(第1/2页)
1999年冬天,期末考试前夕。
宿舍里很安静,只有翻书的声音和偶尔的咳嗽声。窗外飘着小雪,路灯把雪花照得像无数个小精灵在跳舞。
林煜坐在书桌前,面前摊开着《费曼物理学讲义》第一卷的最后几页。
两个月了。
他用了整整两个月,读完了这本八百多页的大部头。
每天晚上熄灯后,他都会打着手电筒,躲在被窝里看。有时候看到凌晨两三点,第二天上课困得不行,但他还是坚持看完了。
因为这本书,就像一把钥匙,打开了他脑海中那个封闭了十几年的世界。
他终于明白了——
原来他“看见“的玻璃珠轨迹,叫做“抛物线运动“,是运动学的基础。
原来他“看见“的缝纫机齿轮传动,叫做“机械效率“,是动力学的应用。
原来他“听见“的电流声音,叫做“电子定向移动“,是电磁学的核心。
原来他“看见“的能量之蛇,叫做“能量守恒“,是热力学第一定律。
原来他“看见“的光粒子,叫做“光子“,是量子力学的起点。
他一直“看见“的那些东西,终于有了名字。
终于有了归属。
林煜合上书,深深地吸了一口气。
他的手在颤抖,不是因为冷,而是因为激动。
十几年的迷茫,十几年的孤独,十几年的自我怀疑,在这一刻,全都有了答案。
第二天,林煜去县城。
他走进新华书店,径直来到文具区,挑了一个硬皮笔记本。
深蓝色的封面,像夜空,像宇宙。
质量很好,纸张厚实,能写很多东西。
18块钱。
这是林煜一周的伙食费。
但他没有犹豫。
“就这个。“他对店员说。
回到宿舍,他把笔记本放在桌上,看了很久。
然后,他拿起钢笔,在扉页上认真地写下:
《我的物理世界》
林煜
1999年12月
下面,他又写了一行小字:
“记录我‘看见‘的一切,记录物理规则在我眼中的样子。“
接下来的一周,林煜几乎没怎么睡觉。
他把十年来“看见“的所有东西,按照时间顺序,一条一条记录下来。
1990年,玻璃珠
我看见:玻璃珠在空中的轨迹,像一条抛物线。
我看见:玻璃珠撞击地面后反弹,角度和入射角相同。
物理解释:
抛物线轨迹→运动学,物体在重力作用下的抛体运动
反弹角度→反射定律,入射角等于反射角
能量损耗→非完全弹性碰撞,部分动能转化为热能和声能
费曼说:任何物体的运动,都可以用牛顿定律描述。
我终于明白了,我“看见“的,就是牛顿定律在起作用。
1991年,缝纫机
我看见:齿轮咬合时,一个齿轮转,另一个也转。
我看见:力从一个齿轮传递到另一个齿轮,像水流一样。
物理解释:
齿轮传动→机械传动,力矩的传递
传动比→大齿轮带动小齿轮,速度增加,力矩减小
效率损耗→摩擦力导致机械效率<100%
费曼说:机械是人类最早理解的物理现象之一。
我终于明白了,我“看见“的,是人类最古老的智慧。
1992年,自行车
我看见:车把左右摆动时,有一个平衡点。
我看见:力矩在两边平衡,像天平一样。
物理解释:
力矩平衡→刚体力学,力×力臂=0
陀螺效应→车轮转动时产生角动量,保持稳定
摩擦力→链条和齿轮的摩擦,驱动车轮
费曼说:角动量守恒是自然界的基本定律之一。
我终于明白了,我骑车时的平衡感,来自物理规律。
1993年,黑白电视
我听见:电流的声音,像蜂鸣,像低语。
我看见:电子在电路中流动,形成闭合回路。
物理解释:
电流→电子定向移动,电荷的流动
电压→电势差,推动电子流动的“力“
电阻→阻碍电流的因素,转化为热能
费曼说:电和磁,是同一种力的不同表现。
我终于明白了,我“听见“的,是电磁力在作用。
1994年,拖拉机
我看见:能量像一条蛇,在发动机里穿梭。
我看见:燃烧产生热,热推动活塞,活塞带动曲轴。
物理解释:
热机效率→化
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