This book provides students and scholars with a fail-safe guide to the key concepts in the field of Sport & Exercise Science. Intelligently cross-referenced entries provide a sound map of the multi-disciplinary demands of sport related courses including physical and biological sciences, social science and education. The entries use clear definitions, examples, and suggestions for further reading to explore each discipline.

Angular Kinetics

Angular kinetics

Angular kinetics has similar concepts to those of linear kinetics, such as force, Work, Energy and Power, although they are somewhat more complicated. The important concepts in angular kinetics are levers, torque and angular momentum.


A lever is defined as a rigid body that rotates about an axis, which is also sometimes called a fulcrum or a pivot. Levers rotate about an axis due to a force being applied, generally to overcome a resistance. In the human body, the bones are the main levers, the joints are the axes, the muscles provide the force by contracting, and the weight of the body segment (with or without an extra implement or weight) is the resistance.

First-class levers are useful if a large resistance has to ...

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