HyperPhysics is an exploration environment for concepts in physics. The site uses maps and other linking strategies to facilitate smooth navigation. Online tutorials cover a wide range of physics topics, including modern physics and astronomy.
This site has quick links to many open physics courses from MIT. These courses include topic on mechanics, electricity and magnetism. The material provided varies per course but you will find exams with solutions and possibly videos from class lectures.
From the University of Colorado, PhET provides fun, free, interactive, research-based science and mathematics simulations. Currently, they have over 200 million simulations. This link is to the physics section.
Topics covered include pre-requisite math and trigonometry; kinematics; forces; Newton's Laws of Motion, circular motion and gravity; impulse and momentum; work, energy, and power; electrostatics; electric circuits; magnetism; waves; optics; and modern physics.
University of California, Los Angeles (UCLA) - website contains reference tables and interactive animations about physics. Topics include motion, electromagnetism, relativity, waves, light, sound, astronomy, heat and matter.
This book is meant as a supplement to a year long freshman level physics course with a trigonometry prerequisite. Some ideas from calculus are included in the book but are not necessary to understand the content. The overview of equations and definitions and eventually sample problem solutions are pertinent to an introductory, college-level physics course.
