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KINEMATICS. The branch of mechanics that deals with motion of a body without reference to force or mass.
KINEMATIC CHAIN. A combination of body segments connected by joints (q.v.) which, when operating together, provide a wide range of motion for the distal (q.v.) element. A single joint only allows rotation, but kinematic chains, by combining joints, enable translational motion to result from the rotary motions of the limb segments. Familiarity with the separate rotary motions and their limitations is necessary for comprehension of the characteristics of the resultant motion. By combining joints whose axes are not parallel, the kinematic chain enables a person to reach every point within his span of reach (q.v.)
KINESIOLOGY. The study of human movement in terms of anatomy of function.
KINESIOMETER. A device which measures parameters of motion such as displacement, velocity and acceleration, either as vector sums, or resolved into component parts. Used to evaluate the effect of changes in the workplace such as chair height, lighting, task elements, drugs, antihistamines, etc., on the motions patterns of the worker.
KINETICS. The branch of mechanics that deals with the motion of a body under the action of given forces.
KNEE SWITCH. A control device which is operated by lateral movement of the knee when seated, requiring operation of the abductor muscles of the leg. In the seated position the leg cannot rotate but the abductors operate with strength, precision and control. Knee switches are used to control sewing machines, etc.
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