Stanford University
Stanford Univ/gravity Probe B/relativity Q&a
Click "Relativity Q & A". Over 200 questions and answers dealing with relativity (special and general), answered by NASA scientist Dr. Sten Odenwald. Answers are generally one paragraph, very clear and coherent.
Physics Classroom
The Physics Classroom: Free Fall and Air Resistance
This lesson in high school physics on Newton's Second Law of Motion provides a discussion of free fall and air resistance, and answers, "Why do objects which encounter air resistance ultimately reach a terminal velocity?" and "In...
Other
Wikibooks: Physics Study Guide
A handy resource that gives an overview of equations and definitions pertinent to an introductory, college-level physics course, with two of its three sections focusing on motion-related topics and principles.
Nobel Media AB
The Nobel Prize: Albert Einstein Biographical
The Nobel Foundation provides this site of Albert Einstein. Includes biographical information about the scientist and other interesting sidebars, such as a video of George Bernard Shaw paying tribute to Einstein.
NASA
Nasa: The Rocket Motor
An online version of a book pertaining to task of launching rockets into space and subsequently navigating them through space. The first several "chapters" (pages) describe the influence of gravity on Earth and the barriers which it...
Cornell University
Cornell University: Astronomy: Electromagnetism and Charge
This site from Cornell University provides a very short, very telling comparison of matter and charge. This is a good site to check out on the subject, with a chart diagram to help with further information.