Different types of pulleys are described in this introductory book, including those used on flagpoles and cranes.
Full-color photographs and simple text introduce young readers to the fundamentals of what makes things go in this first introduction to the mechanics that drive simple machines.
• Controlled vocabulary
• Easy sentence structures
• Clear linkage between text and photos
• Positioned in the middle Early Intervention range (levels 8–13)
• "New Word" listing
• "To Find Out More" section