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Like many others who use this, I am an engineering student and used the two parts of this book for my Statics and Dynamics classes. Trying to plan ahead, I bought the combined Statics & Dynamics book for my Statics class. With no warning, the publisher then released the 9th edition of this book, rendering my 8th edition obsolete and forcing me to buy this, the 9th edition Dynamics book, but also giving me the opportunity to compare the two. There is almost no difference in content between the 8th and 9th editions -- the sections explaining the material and the examples are directly copied. The homework problems were all changed, however, rendering it impossible to use an old version for a class (mostly they just rearranged the problems and changed the numbers). This is profiteering at its worst and shows me that the publishers (and likely the authors, too) are interested in nothing more than making a profit at the expense of students.
Regarding the content, this book is okay, but certainly could be better. The statics part of the book was better written and better explained. I managed to learn the material and did well in the class, but sometimes couldn't figure out why my answers didn't match the book's on homework problems. I guess I could have bought a solution manual, but I feel that a text should contain enough information for you to understand how to do any homework problem it contains. This book could have done more to clarify what assumptions can be made in certain cases (i.e. what can you assume when a body is rolling without slipping?). In general, the information was all there, but not well organized.
I found it easier to understand the concepts out of Meriam's book. I'm sure this is an important and useful text, but wow is it dense.
One tip: beg, borrow, or steal the solution manual for this text... the problems are absolutely, without question, infeasible without it. Others have said it: they're just too hard. I don't understand what he was thinking writing impossible problems. My 190 year old professor couldn't even solve many of them.
This book is very poorly written. I suspect the authors are either morons or simply wrote this book with the intention to confuse readers as much as possible! Dynamics is a very important course in engineering, and it is crucial to not get confused about its concepts in your early career which is why you should not use this book. As also pointed out by others this book is just a piece of garbage from hell. DO NOT buy it. You have been warned.
Worst book I have ever used in my engineering career. Not only are the examples vague but the book is even more dry then the cover seems. I do not recommend buying this book unless you desperately need it for your class. Goodluck if you have a bad professor because you will then need the solutions.