Walter Lewin on Moments of Inertia and Coefficients of Friction

This ought to be quite thought-provoking. Especially for people who are interested in the efficiency of automobiles, trains and things like that.


For more on the intuition behind the reason why the hollow cylinder takes longer, 11 minutes 42 seconds, see Jade's video on Variational Mechanics:


See also:


And:


See also Structure and Interpretation action of Classical Mechanics:
This book is dedicated,
in respect and admiration,

to

The Principle of Least Action
The text is based on the approach to differential geometry described here: Functional Differential Geometry - MIT. This has applications in machine learning: from https://news.ycombinator.com/item?id=7884551: "Treating data as a distribution in high-dimensional space is at the core of machine learning, and differentiating across those dimensions is typically how learning is done."

Here's Walter's YouTube channel.

Walter Lewin on what makes a good lecture:


And Walter has an intriguing problem with shipping his books:


That video has had 72,000+ views in just two days. The one on Moments of Inertia, above, has 2,082,910 views. See This is Cheering: Lori on Self-Promotion for more on modern-day mysteries of commerce.

I wonder whether Ross Anderson has such trouble getting his books out? See More From Cambridge and Why is Telecommunications Security Important?

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