The researchers at The Jason Project are working on a new curriculum entitled Terminal Velocity. While the ultimate goal is to investigate the major forces in our universe, the only unit they have completed so far is A Universe of Motion: Motion, Velocity, and Momentum. This section looks at the concepts in the title, particularly through the use of test crash dummies to determine vehicular safety.
While I haven't tried this curriculum myself, because that is not what we are doing in science these days, I have done a number of the other The Jason Project curricula and found them all to be useful. So if you have a middle school who is interested in cars, racing, crash safety, and the like--or if you are studying velocity and momentum--I would check out this FREE online curriculum