Audience: Students; Grades: 4-5; Subject: Science. (2004) Investigates how and why objects move. Uses visual examples and real-life demonstrations to explain the concepts of force, gravity, friction, inertia, speed, velocity, and acceleration. For the teacher's guide go to: https://drive.google.com/folderview?id=0B9ZT7PYcIjLfNTU0aXNUb3RvQms&usp=sharing