This week's learning module is UP.

Your learning module for this week is now up. You can look for it in the light bulb folder on the course home page.

With this chapter on momentum, we begin the study of the concepts that will help us analyze and comprehend the gravitational tractor project, designed to protect Earth from asteroid impact... we hope!

Chapter 5 learning module is UP.

Last learning module for Exam 1 is now available in Webcourses. It is about universal gravitation.

There are links to two articles about theoretical spacecraft, and you can scan them now for gravitational concepts. The main import of the articles, however, will be in chapters 6 and 7 on momentum and energy.

The Week 6 learning module is up.

The energy learning module for Week 6 is now up. Personally, I think this is one of the most challenging concepts we will tackle this semester: energy and its meaning.

Please turn loose with plenty of questions in the Discussions area. The TAs and I will be reading and replying.

And I will try to find some of my old energy podcasts for iTunes U.