About the Authors Kenneth Rideout, M.S. (Wayland, Massachusetts) has been teaching high school physics for more than fifteen years in the Boston area and is currently the science department head at Wayland High School in Wayland, MA. He has a B.S. in Honors Physics from Purdue University and an M.S. in Physics from Carnegie Mellon University.

Jonathan Wolf, M.A., Ed.M. (Madison, New Jersey) has been teaching physics at both the secondary school and college levels for more than thirty-five years and is currently an adjunct professor of physics at Fairleigh Dickinson University in Madison, New Jersey. He has also published over forty professional papers in the fields of astronomy, physics, and physics education and served for more than ten years as assistant editor for The Science Teachers Bulletin published by the Science Teachers Association of New York State (STANYS). About the Publisher Many great things begin with a tiny spark, and for Manuel H. Barron that spark came from a mimeograph machine in the basement of his Brooklyn, NY, bookstore in the late 1930s.

People from the community asked Mr. Barron for books to help their children study for the New York State Regents exams. After realizing there wasn't anything available, Mr. Barron created his own study guides. Now, more than 80 years later, Barron's continues to help millions of learners worldwide prepare for their next steps. With offerings from pre-college prep to world language guides and professional certification exams, Barron's wants to be part of your success story no matter what learning path you're on. You can trust Barron's to provide exceptional products created only by top experts with years of experience in education. From generation to generation, our mission remains the same: Learn, grow, and succeed with Barron's throughout your life-long learning journey.