I thought these sections were pretty interesting, but I wasn't sure of the use of the quasistatic approximation. We use it to be able to talk about path-independent quantities and then to justify more symmetries. However, it seems like motion in which there is no acceleration isn't too interesting, since it excludes wave phenomena and all sorts of other things. I'm having a little bit of trouble following through on where we need the quasistatic approximation and when we don't, and whether we'll need to keep in mind that some of the things we derive aren't valid when acceleration is present.
It's cool how we now have a potential energy function. That seems like it'll be very important, and adds a lot to my understanding of the system.
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