Examines the many different parts of electric express trains, looking at the power cars, wheels and suspension, the track, electronics, the cab and controls, various cars and carriers, diesel locomotives, and underground trains.
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.
Explores gravity, defining what it is, describing how it is measured, and providing information about scientist who made discoveries about the force. Includes related experiments.
"Explains how main battle tanks and infantry vehicles are used in the military, including the parts and functions of tanks. Includes facts about current and historical tank models."--Provided by publisher.
"Describes how jet planes such as fighters and bombers are used in military combat, and how these planes work. Includes facts and figures about specific military planes"--Provided by publisher.