Walking on a balance beam or riding a bike both require motion and balance. This program will reveal how unbalanced forces create motion, while balanced forces keep things still. Students also learn how concepts like velocity, acceleration, and momentum fit into this puzzle. A unique hands-on activity combined with vivid imagery and graphics explores the ways in which opposing forces can be balanced and unbalanced. This 23-minute videotape correlates to the National Science Education Standards for Physical Science--properties of objects and materials, position and motion of objects, and light, heat, electricity, and magnetism. The program includes a teacher's guide. (MM)