This engaging volume introduces emergent readers to the wheel and axle. Photo illustrations and clear language explain how these simple machines work and where

Teaches the definition and uses of wheels and axles as tools, as well as examining different types of wheels and axles.

Introduces the characteristics of the simple machines known as pulleys and presents some of the jobs that pulleys do.

Teaches the definition and uses of the gear as a tool, as well as examining different types of gears.

Teaches the definition and uses of the wedge as a tool, as well as examining different types of wedges.