Track and field coaching is considered an art embodying three sciences--physiology, psychology, and dynamics. It is the area of dynamics, the branch of physics that deals with the action of force on bodies, that is central to this book. Although the book does not cover the entire realm of dynamics, the laws and principles that relate directly to track and field coaching, or that are necessary as background information, are included. The language is simplified, and some of the physics terminology has been altered (a glossary is appended). Principles discussed, with practical applications and photographs, include: motion; center of mass, curves of flight; axes; momentum; inertia; conservation of rotary momentum; turns from the ground; aerial turns; inertial axes; falling bodies; secondary axes; action-reaction on the ground; and centrifugal force. A bibliography is included. (MM)