Fundamental Biomechanics and Applied Physics

"Every movement the body makes obeys the same laws that govern a thrown ball, a leaning ladder, or a spinning wheel. Biomechanics is simply physics applied to living things — and once you have its language, the body stops being a mystery of effort and feel and becomes a system you can measure, predict, and reason about. This chapter lays out that language: the branches of mechanics, the difference between a number and a vector, the units everything is measured in, and the simplifying models that make a body's bewildering complexity solvable."

This book supplies the general physics of movement that the rest of the curriculum draws on. Book B3 (Joint Mechanics and Kinesiology) deliberately took only the mechanics it needed for the joints and handed the underlying physics here; Book B5 will apply that physics to athletic skills. To get the most from those books — and to reason about force, speed, power, balance, and impact in your own training or coaching — you need the shared language of mechanics. This chapter builds that vocabulary and the mental map of how the pieces fit, so every later chapter has a place to hang. It also sets the tone: biomechanics is a quantitative discipline, and learning to put numbers on movement is its central skill.