Automobiles and Motorcycles
During the first half of the twentieth century, the automotive industry grew rapidly in the United States. The automobile became a key transportation technology, providing an important lifeline for the society.
The automobile has a number of parts, including the body, engine, chassis, and transmission. Each car has thousands of component parts, and it is a complex technical system.
The body of the car is made of steel, fiberglass, or strong plastic. The interior of the car has a passenger compartment and a trunk. The body also has fenders and safety features. Some cars have four-wheel drive.
The engine is the heart of every car. It produces electricity for the other systems in the car. It also pumps gasoline from a tank to the engine. Increasingly, modern cars have turbo chargers, which create extra power.
The automobile industry has become one of the largest industries in the world. There are millions of people working in factories that produce cars.
Today, the automobile is the most common form of transport in the world. Every year, over three trillion miles are traveled in the United States. This means that the automobile has a large impact on air pollution.
The United States is also home to many of the largest automobile manufacturing facilities in the world. Many of these factories employ a variety of workers. The industry has become a highly competitive business. Manufacturers have developed many different designs and features to keep up with demand. The competition has helped to make the automobile industry more affordable for the middle class.