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This reminds me of a great film on crafting quartz crystals for use in radios: https://youtu.be/wHenisSTUQY
Earlier quoted context omitted.
The general motors today is not the same company that made this video. In 2008 the original general motors was effectively dissolved, the current GM simply purchased some of their assets, which happened to include their names and trademarks.
Having 1937 next to the name of any modern day company would imply such.
And now differentials are basically obsolete - not needed in electric cars.
Why is that? Tesla Model 3 for example uses 1 or 2 motors, not one per wheel, so they still need to add variable speed to left vs. right wheels, right?
The style in those old films is so relaxing and pedagogically great. Has anyone else noticed that today's educational content intended for adults increasingly uses a format that was regionally only used for very young children? There is almost always personality emoting and doing accidentally on purpose funny things and laughing, exaggerating everything to keep people engaged.
I agree that this is definitely a trend, so I feel like highlighting a great example of educational content that is very dense, concise, and with just a touch of whimsy: 3Blue1Brown on Youtube[0]. He has been doing math education videos on YouTube for years. I just watched his latest video on the medical test paradox and redesigning the Bayes rule to address it[1]. All his videos are absolutely phenomenal - the best…
If you enjoy this, don't miss the video lecture on World War 2-era mechanical fire control computers by the U.S. Navy. I learned you can do a lot of computations with gears and shafts. https://www.youtube.com/watch?v=gwf5mAlI7Ug
The style in those old films is so relaxing and pedagogically great. Has anyone else noticed that today's educational content intended for adults increasingly uses a format that was regionally only used for very young children? There is almost always personality emoting and doing accidentally on purpose funny things and laughing, exaggerating everything to keep people engaged.
Even the ones that are not hit-you-on-the-head scatological are still, as you say, trying to be funny and engaging but in a patronizing way.
Perhaps I am not the target audience but I preferred young science books that made you feel like you were learning real science — learning about the chemistry of plastics for example. The science wasn't a footnote to the experiment, it was the reason for the experiment.
Mae and Ira Freeman's science books for kids were great for younger readers. Kenneth Swezey's books. The classic "Golden Book of Chemistry" is a little slick, but still good (https://www.academia.edu/37919681/The_Golden_Book_Of_Chemist...).
Or maybe I just preferred the presentation of the older books...
That suggests that it didn't just tell me how a differential works. It taught me how someone who needs to invent a differential should think about the problem.
Earlier quoted context omitted.
The differential (ignoring locking ones) applies the same force (approximately) to both wheels. If you remember your physics course about lever and force, see the video at 5:00, you can see that the lever is pushed by its center, hence both sides have the same length. So the same force is applied to both wheels. But the speed can be different. Hence, if one wheel is stuck, it still receives the same force as the othe…
> you can see that the lever is pushed by its center, hence both sides have the same length. So the same force is applied to both wheels. This is not necessarily true. Imagine a similar symmetric lever with a weight on one side, and a force on the axis that accelerates rotation. The acceleration of both ends of the lever are equal, but the force is not equal (since the weight is 0 on the other end). Anyway, the point…
Anyway, I did write "approximately" to avoid discussing acceleration/inertia of the differential itself. I should have written "in steady state" or something like that. It is true that a complete discussion can be more involved
The style in those old films is so relaxing and pedagogically great. Has anyone else noticed that today's educational content intended for adults increasingly uses a format that was regionally only used for very young children? There is almost always personality emoting and doing accidentally on purpose funny things and laughing, exaggerating everything to keep people engaged.
I was expecting explanations to begin shortly, got bored after the second stunt. The format is, frankly, horrible. This must be the analog of the "You want a tutorial to do X? Lemme record myself writing painfully slowly in "New Document.txt to explain it." style of tutorials.