This edition, co-authored by Roger Freedman and Hugh Young, reflects the findings of current research in physics education, while adhering to the highest standards of rigorous, yet accessible content coverage, and pedagogical effectiveness. Goals of this revision include helping students develop physical intuition, and building strong problem-solving skills. Two decades of research on the conceptual pitfalls that commonly plague beginning physics students are reflected in this work. A key focus of the Ninth Edition is to discuss the correct way to analyze a situation or solve a problem, as well as why the wrong way (which may occur to a student first) is indeed wrong.