Automobiles are powered by internal combustion engines (sometimes called motors) that convert chemical energy into mechanical energy. This energy is sent to the wheels to make them turn, thereby driving the automobile. Most cars use gasoline, but some use other fuels such as diesel and kerosene. The amount of energy the engine or motor sends to the wheels is measured in kilowatts or horsepower.
The automobile changed many things about American life and society. It gave people more freedom to travel, which opened up jobs and places to live in new ways. It also brought new leisure activities and services, such as restaurants and fast food. But it also caused harm, such as air pollution and the destruction of undeveloped land for highway construction. And it led to new laws and government requirements, such as safety features like seatbelts and rules for driving on the highway.
Most automobiles have a brake, which reduces the speed of or stops the car. It works by bringing a stationary surface into contact with a moving one that is being driven, causing friction.
Most of the time, when you drive an automobile, it is because you want to get from one place to another. It saves you time on your commute to work, on shopping trips or visiting friends and family. It also lets you avoid traffic jams and take different routes if construction or an accident is blocking the usual route. Having your own automobile can also give you more flexibility to change your schedule or go on vacation when you wish.