Introduction

During the twentieth century, more progress has been made in Technology and Science than was made in all the previous centuries since the beginning of time. The Apollo program program has established the reality of travel between the earth and the moon and the possibility of establishing manned research stations on the surface of the moon. Interplanetary communication and exploration has been accomplished. Although less spectacular than space travel, great advances have been made in air transportation and the automatic control of aircraft. The Jumbo jets, Airbuses and Supersonic transport aircraft have brought air travel throughout the world to millions of people who could not have had this advantage a few years ago. All these accomplishments are the result of the application of the laws of physics. In our present age the person concerned with the operation, maintenance, or design of any of the thousands of mechanical and electronics devices in regular use is constantly faced with the application of scientific law.

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A very simple example applicable to millions of people is the driving of an automobile. If the driver understands the physical laws governing the operation of the engine and the driving mechanism of the car and also understands the forces affecting the car as it moves on the street or highway, that driver can operate the automobile more safely and in a manner that will prolong its life. The world in which we live and work is almost completely dependent upon ‘modern conveniences’ such as electrical appliances, automobiles, airplanes, steamships, radio, television, spacecraft and others too numerous to mention in our limited space. Most of the jobs or positions at which we work involve some technical ‘know-how’ and technical know how involves an understanding of basic scientific law. To provide technicians interested in aircraft and space vehicles with basic technical knowledge pertaining to these devices, it is desirable that we examine briefly of the common laws of physics. In our study here we shall explore the areas of mechanics, heat, sound, electricity and magnetism. While studying these principles that the trainee will recognize their many applications to familiar devices.