Feynman is one of my favorite authors, along with scientists like Gould and Dawkins. I own and have read most of his books, including his lectures on physics. I particularly like his way of teaching, and the way he puts explanations at the student's level. I've spent too much time around bellicose instructors who mistook for knowledge a vocabulary full of multi-syllable words and long tortured sentences; Feynman is their antithesis.
Ralph Leighton and Michael A. Gottlieb are co-authors of "Feynman's Tips on Physics." In addition to editorial work associated with assembling Feynman's lectures, Leighton wrote the Forward, and Gottlieb the Introduction. There's also a Memoir by Matthew Sands describing the origins of the Feynman Lectures on Physics. Leighton and Gottlieb hunted for and found the (nearly lost) tapes and photographs and were the ones who negotiated (for about 5 years) with Caltech, the Feynman heirs and Addison-Wesley to arrange the book's execution. They also edited and illustrated the book.
Feynman's lectures in this book had their genesis in his concern, and among scientists and educators at Caltech, regarding the way they were teaching physics. Feynman's lectures in "Tips on Physics" came about as a consequence of Feynman giving additional help to students, particularly those who were having trouble keeping up. There's more to the book than Feynman's lectures, however, including Matt Sands memoir, and exercises in chapter 5.
While Gottlieb and Leighton are co-authors of "Tips," the part I liked best was purely Feynman. My thanks go to them primarily for making Feynman's teachings more accessible through their historical research into archived material. One of the things I like best about Feynman is his sense of humor. Take, for example, this snippet from page 17:
"...we've found a very serious problem [with grading]: no matter how carefully we select the mean, no matter how patiently we make the analysis, when they [the incoming students at Caltech] get here something happens: it always turns out that approximately half of them are below average!"
This was part of Feynman's explanation to the struggling students, explaining that even though they had been the best and brightest in their high schools, when they all came together half of them were going to be below average for the first time in their lives.
I consider "Tips on Physics" to be a good book, but it's probably the book I like least of all those devoted to Feynman's work. I suppose part of the reason is that the book isn't composed in a particularly logical way, and doesn't flow naturally from foundational concepts to derived topics. That's probably due to the circumstances in which the book was written; it's something of a hodgepodge of lectures given to struggling students, combined with material from the other authors in a form that doesn't flow as well as I'd like, with topics bounce around a bit.
Subjects include vectors (adding, subtracting, line, etc.) and the laws of gravity and motion. There are also solved problems that show how to use these various concepts. The end of the book consists of somewhat lengthy and quite interesting discussions about dynamics, including practical uses of gyroscopes and accelerometers. There's interesting practical material here, including the use of gyroscopes in stabilizing various platforms, and navigational systems using gyroscopes and accelerometers (see figure 4-21 on page 116).
The discussions about gyroscopes were the most interesting to me. These devices represent some of the most amazing mechanical inventions/designs of all time. Combined with accelerometers they form a complete navigational system. Such systems were critically important during the cold war, and were closely guarded secrets, since they were essential for targeting and delivery of nuclear weapons - both by intercontinental ballistic missiles as well as bombers. For example, on page 117 the book explains that an error of just 10^-5 g results, after integrating twice over an hour, in a positional error of over half a kilometer. Integrating twice for 10 hours increases the error to 50 kilometers.
Even though this isn't Feynman's best work I enjoyed it very much and consider it well worth reading.