In the Inertia leveled reader, fundamental scientific concepts in physics are explained through simply written text and colorful, fun illustrations. Young readers learn that physics explains that force is any action that changes the location of an object, the shape of an object, or how fast or how slowly an object is moving. The Greek philosopher Aristotle thought force is what makes things move. However, the Italian scientist Galileo found that Aristotle was wrong and it is actually inertia that keep things moving, while forces make things stop or change direction. When an object resists a change in motion, it has inertia. Inertia keeps objects that are in motion moving and objects that are not moving at rest. A pronunciation guide of scientific terms is included. 24 pages filled with engaging, colorful illustrations. Reading Level 1-3, Interest Level 2-5.