wedges

Describes what ramps and wedges are and how they work, different types of ramps and wedges and their uses, and other facts about these simple machines.

Introduces young readers to wedges, explaining what they are, how they work, what they have been used for throughout history, and how they might be used in the future.

Text and pictures introduce the wedge, a simple machine placed between objects to split, tighten, or secure a hold.

Explains the science of how ramps and wedges work, discussing real-life examples such as scissors, zippers, slides, and ski jumps, and includes activities that illustrate the principles covered.

A photographic introduction to wedges for beginning readers, explaining what wedges are and how they work, looking at examples of wedges, and discussing the use of wedges in complex machines.

Outlines the characteristics and advantages of a wedge and highlights a variety of ways this simple machine is used in real-world situations. Features several hands-on activities, full-color photographs, and a glossary.

Explores different machines created by the ancient Chinese, Middle Easterners, Greeks, and Romans including wheels, pulleys, levers, war machines, and wheelbarrows.

Uses everyday examples to show how wedges are simple machines that make pushing, pulling apart, and lifting easier.

Defines ramps and wedges and shows how they are incorporated into more complex machines.

Uses everyday examples to show how wedges are simple machines that make pushing, pulling apart, and lifting easier.