Honestly I assumed that it’s because θ and φ are nice, round letters, very circular, good for angles. This is what I believe and you cannot change my mind.https://twitter.com/RadishHarmers/status/868385432354004992 …
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@RadishHarmers You haven't seen numberphile and sixty symbols? Couldn't find the vid on those two symbols, but here's degrees and angular momentum. https://www.youtube.com/watch?v=eFS5Maa3bGY …https://www.youtube.com/watch?v=sy5NY-Dqdys …
The explanation in this video for why a bicycle stays upright is wrong. The wheels don’t have enough angular momentum to stop a bike from falling over. The rider continually makes small steering corrections to stay upright and on course.
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You can see it two ways — 1. If you start a bike moving in a straight line with no rider it will quickly fall over 2. You can design a bike with counter-rotating wheels (so zero AM) and you can still easily ride it.
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I literally got a recommendation this morning from my YouTube algorithm to watch a video on this...
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Bikes can actually stay upright without a rider if traveling at sufficient speed and obviously you can also ride quite easily with your hands off the handles. It is still a bit of mystery but it seems like the bike design itself will steer into a fallhttps://arstechnica.com/science/2011/04/moving-bikes-stay-uprightbut-not-for-the-reasons-we-thought/ …
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Can't believe I remembered this article from a decade ago
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