Oxlade, Chris

Explains that screws are simple machines; describes their functions, including gripping, squeezing, connecting, and moving; and includes two hands-on activities.

Explains in basic terms the physical principles behind levers and shows with diagrams how several examples work, including wrenches, pliers, bolt cutters, and levers in machines such as tractors and bicycles.

Describes what pulleys are, how they work, and what they are used for in everyday life.

Introduces electrical circuits, discussing what they are, how they work, and how they are used.

Presents a children's book for early readers that describes big machines and what they do including the biggest dump truck in the world, crane, airplane, helicopter, space shuttle, and more.

Looks at many different types of motorcycles, and includes a brief history of motorcycles, as well as a general description of how they work.

A simple presentation of how homes are heated, how to use less energy to heat a house, and where that energy comes from.

Explains what energy is, looks at different forms of energy and how they change, describes stored and heat energy, discusses the sources of energy, and includes related activities.

Provides information about the properties of oil, explains where oil comes from, and looks at different types of oils and their uses. Includes a glossary.

Introduces basic concepts of weather, discussing such topics as atmospheric pressure, clouds, rain, and wind.