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

What do clocks, bikes and car engines have in common? They all use gears. Readers of Gears in My World will learn how these interlocking toothed wheels work and

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 wedge as a tool, as well as examining different types of wedges.

Uses everyday examples to describe inclined planes as simple ways to make lifting, pushing, moving, and building easier.