KNES 300 Lecture Notes - Lecture 8: Angular Displacement, Transverse Plane, Angular Distance
19 Feb 2017
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Document Summary
Nearly all movement involved rotation of body segments about axes through joint centers. Angular kinematics: critical for understanding these movements. Particles (linear kinematics: point mass, example: whole-body center of mass (com, only translates. Bodies (angular kinematics: have a particular shape, mass and inertia, example: the foot, translation and rotation. Most human whole-body movement is curvilinear (e. g. , locomotion) Some pure angular motion (e. g. , weightlifting machines) Need both translation and rotation information to describe a segment"s pose. Body segment: section of the whole body between two joints. Clinicians and biomechanists often use planes of motion to describe angular position: xy-plane. Defined by two vectors or three points. Cross product gives a vector describing a plane. Each body segment has its own set of sagittal/frontal/transverse planes. Each joint has its own set of planes as well. In 2d: often deal with sagittal motion only. Local thigh and shank coordinate systems; global lab coordinate system.
