This website contains a series of peer instruction problems on the topic of gravity, designed to be solved in a classroom setting. The problems are presented with a qualitative (usually multiple choice) question that is carefully constructed to engage student difficulties with fundamental concepts.  Students consider the problem individually and contribute their answers using personal response systems (clickers).  Students then confer with their cooperative groups and vote again on the correct response.  Topics covered include orbits, Newton's Law of Universal Gravitation, and circular motion.

This is part of the Physics Suite collection, containing sample problems, peer instruction problems, and alternative homework sets.  This is a freely accessible online book by the author that explains the  principles and pedagogy behind The Physics Suite and in-depth instructions for its use in the introductory physics classroom.