The inhabitants of Mammoth Island are trying to find the best method to lift their mammoths when a young Islander uses a simple machine called a pulley to get the job done. A pulley is a wheel that carries a rope, chain or cable on its rim and can be used alone or with other pulleys to lift heavy loads.

Defines work, describes machines, and discusses different kinds of pulleys.

"What kinds of everyday objects use levers? What do pulleys do? Questions such as these are answered in this age-appropriate text about the science behind levers and pulleys, which is a essential physical science concept. Fact boxes, informative diagrams, and vivid, full-color photographs add extra insight, appealing to budding scientists who are curious about machines and the parts that make them function. Readers are exposed to STEM topics in a...