Turn students' attention inward to centripetal force. Introduce orbits, rotational motion, Newton's laws, and force diagrams. Gelatin chambers require 2 to 3 hours' refrigeration. Construct force chambers 1 day ahead to allow glue to dry overnight. Materials build 10 centripetal force chambers and 2 gelatin chamber demonstrations. Instructions included; 1-hole punch, balance (0.01 g), timers, glue, general classroom supplies, and tools and materials to prepare gelatin are needed but not supplied.