This document summarizes key concepts from several chapters in an introductory physics textbook, including circular motion, rotational mechanics, universal gravity, gravitational interactions, satellite motion, special relativity, vibrations, and waves. Key ideas discussed include tangential and radial speed in circular motion, torque and lever arm in rotational mechanics, gravitational fields and their relation to mass, how satellites orbit Earth, how Einstein introduced special relativity and how it relates to motion and the passage of time, length contraction at high speeds, and the properties of simple harmonic motion and wave energy transfer without matter transfer.