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Feynman: How the train stays on the track FUN TO IMAGINE 7

推荐理由

That doesn’t seem to be a charitable reading and in any case it has to do with wheel taper, more like cone than cylinder. More specifically the nature of the solution was getting two parts of the org, track and train, to work together. While that may seem elementary stuff, anyone at a big org can attest to how often it is tremendously difficult to do sometimes. I write this not as an apologist for commuter rail, which I find excessively expensive and inflexible outside of very circumstances, but as an excuse to link to the lovely Feynman description of why train wheels are tapered: [VIDEO]

推荐adolph · 原文2022年9月

说明

这是2008年由Christopher Sykes发布的一部讲解，主题归在Fundamental physics。它讲的是train wheel physics这一支里的具体问题，而不是把整个领域扫一遍。适合按兴趣直接看、不打算先补课的人。内容上可以概括成：A short clip from the 1983 BBC series Fun to Imagine in which Richard Feynman explains how a train stays on the track. He covers the geometry of tapered wheels that steer the train back toward the center of the rails.这些读者给出的理由，核心是：HN people link it as Feynman's charming and clear explanation of why train wheels are tapered, whenever trains, bicycles or steering come up.讲法不绑某一条新闻，过几年仍然可以当材料看。从2013年到2022年，有1位不同的读者在1个不同月份把它推荐出来，其中明确叫别人去看的有0次。适合用一集把一个概念补上的人。抓住它用的那个图像或类比，比背公式重要。如果已经会了基本定义，就把注意力放在它怎么把train wheel physics变成能跟着复述的例子。

视频信息

频道: Christopher Sykes
时长: 2 分 27 秒
发布年份: 2008

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