Book excerpt: UNLOCK THE SECRETS OF PHYSICS with THE PRINCETON REVIEW. High School Physics Unlocked focuses on giving you a wide range of key lessons to help increase your understanding of physics. With this book, you'll move from foundational concepts to complicated, real-world applications, building confidence as your skills improve. End-of-chapter drills will help test your comprehension of each facet of physics, from mechanics to magnetic fields. Don't feel locked out! Everything You Need to Know About Physics. • Complex concepts explained in straightforward ways • Clear goals and self-assessments to help you pinpoint areas for further review • Bonus chapter on modern physics Practice Your Way to Excellence. • 340+ hands-on practice questions in the book and online • Complete answer explanations to boost understanding, plus extended, step-by-step solutions for all drill questions online • Bonus online questions similar to those you'll find on the AP Physics 1, 2, and C Exams and the SAT Physics Subject Test High School Physics Unlocked covers: • One- and Multi-dimensional Motion • Forces and Mechanics • Energy and Momentum • Gravity and Satellite Motion • Thermodynamics • Waves and Sound • Electric Interactions and Electric Circuits • Magnetic Interactions • Light and Optics ... and more!