UMass Amherst KIN 430 - linear-kinematics-1 (7 pages)

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linear-kinematics-1



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linear-kinematics-1

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Pages:
7
School:
University of Massachusetts Amherst
Course:
Kin 430 - Biomechanics

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Linear Kinematics of Human Movement Ch 8 Kinematics Physics Part I Basic Kinematic Quantities Position Displacement Distance Velocity Speed Acceleration Other areas of physics Mechanics Statics Dynamics Differentiation Integration Linear Kinematics of Locomotion Kinematics Kinetics Uniform Acceleration Projectile Motion Copyright 2014 Brian R Umberger Ph D University of Massachusetts Amherst More Definitions Linear kinematics the description of linear motion there is either no rotation or it is not explicitly considered Scalars Vectors Scalar a quantity that has magnitude only Vector a quantity that has both magnitude and direction Kinematics Description of motion without reference to the forces that caused the motion Quantifying Human Motion When someone moves runs walks jumps how can we quantify their motion Examples 30 mph is a scalar 30 mph due east is a vector 1 Phases of a Movement Phases of a Movement To facilitate analyses it is common to divide a movement sequence into two or more phases Many discrete movements can be described as consisting of a preparation phase an action phase and a follow though phase stance and swing phases of the human gait cycle preparation action follow through Temporal Analysis Frames of Reference The time spent in each phase is one of the most basic descriptions of a movement sequence Global reference frame Also called inertial fixed or laboratory reference frame Typical values for an adult walking at normal speed Stride 0 92 sec Stance 0 55 sec Swing 0 37 sec Stride Absolute position of Z the pelvis in a global reference frame xP yP zP Y X 2 Frames of Reference Collecting Kinematic Data local or segmental reference frames Many different types of systems exist for data collection joint based reference frames Electrogoniometers Abd Add XT YT Accelerometers Flex Ext Electromagnetic tracking Optoelectronic systems ZT Video based systems Int Ext Rot Cameras track reflective markers placed on body segments reference frame fixed to the



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