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Physics I For Dummies, 4th Edition, is all about physics from your point of view. We know that most physics students share one common trait: confusion. As in, “I’m confused about what I did to deserve such torture.” This book is different. Instead of writing it from the physicist’s or professor’s point of view, we wrote it from the reader’s point of view. We’ve taken great care to jettison the top-down kinds of explanations in the usual book presentation of this topic. You don’t survive one-on-one tutoring sessions for long unless you get to know what really makes sense to people — what they want to see from their points of view. In other words, this book is designed to be crammed full of the good stuff — and only the good stuff. We tell you what you need to know, exactly how you need to know it — and work out plenty of sample problems to help you figure out how to put these ideas into action. You’ll also discover unique ways of looking at physics problems that professors and teachers use to simplify the process of solving these problems. Some books have a dozen conventions that you need to know before you can start. Not this one. All you need to know is that variables and new terms appear in italics, like this, and that vectors — items that have both a magnitude and a direction — appear in bold. Web addresses appear in monofont.