Bill Nye explains the physics behind motion. The science guy explains how motion is caused by force and energy and introduces Newton's three laws of motion. Defines mass, identifies inertia as a property of matter, and demonstrates how inertia impacts movement. Presents a variety of examples illustrating the mechanics of applied force, unbalanced force, acceleration, and equal and opposite reaction.

Award-winning series explores the world of science and nature using humor, music, experiments, and interviews with scientists. DVD features fully indexed chapters correlated to national science standards, downloadable teacher's guide, interactive glossary and quiz, Internet links, and bonus materials.