For details on contents, system requirements and how to get Free-Body Model, click on the screen shot below. The image is a family of trajectory curves for a projectile, with air resistance the varied parameter.

Free-Body Model is a learning program for physics students, teachers and other people curious about mathematical modeling of physical systems. It provides a new level of interactivity through run-time technology. Teachers may use the included authoring tools to create lessons for use in the classroom or for independent study.