This textbook provides a scientific basis for the study of human motion. The eight chapters are organized under three major sections. Part One--The Force-Motion Relationship--contains chapters on (1) motion; (2) force; (3) types of movement analysis. In Part Two--The Simple Joint System--chapters concern (4) simple joint system components; (5) simple joint system operation. In Part Three--Movement: A System-Surround Interaction--chapters deal with (6) control of muscle force; (7) patterns of muscle activation; (8) performance evaluation. The appendices provide information on: (1) metric units; (2) basic mathematics; (3) natural trigonometric functions; (4) body segments; and (5) abbreviations. Problems are posed at the end of each chapter and their solutions are given following the last appendix. A glossary of terms and references are also included. (JD)