Having trouble with a particular concept? These online tutorial sites offer interactive instruction and practice. More of these sites come online every year. If you find good ones that I don't list here, please let me know. GBA
An introductory exercise on 1D motion.
A nice tutorial on Motion and Graphing.
The interactive practice exercises within these three topics are all excellent, but stay away from the DEMOs, as those tend to be buggy, and may crash your browser. GBA
The "Sum of Forces" exercise in Dynamics, Part D. is particularly good. GBA
Here is an excellent Free Body Diagram MC quiz (note the directions in the FBD's are not always perfect, but that doesn't really harm the quiz). GBA
Some simple exercises at recognizing forces. GBA
Here are some explanations at the AP High School Level for Momentum and its Conservation. GBA
Good, short explanations of the concepts involved in Rotational Motion. GBA
This SHM tutorial is very good. I found only one error, at the end of the "Initial Phase" section (the right answer for that question is either 3pi/2 or -pi/2). I have one other minor complaint. It says "the acceleration is a maximum" when the acceleration has its maximum positive value. OK, but normally the phrase "the acceleration is a maximum" would refer only to the magnitude of the acceleration. But in particular the training in "Amplitude, Period, and Frequency" and "Velocity and Acceleration" is excellent. GBA
Here are some explanations at the AP High School Level for Wave Motion and Sound. GBA
Here are some DC circuit basics and some DC circuit MC questions. (Note that some of the "simulated experiment" links within this DC Circuit tutorial were broken the last time I looked.) GBA
In the DC Circuit Tutorial there are some broken links for simulated experiments using Kirchhoff's Laws. The proper links are given here: