# UMass Amherst KIN 296 - angular-kinematics (4) (11 pages)

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## angular-kinematics (4)

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Pages:
11
School:
University of Massachusetts Amherst
Course:
Kin 296 - Independent Study
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Angular Kinematics of Human Movement Ch 9 Angular Measures Relative versus Absolute Angles Angular or Rotational Motion Angular or rotational motion occurs when an object moves in an arc about an axis The axis may be real or imaginary but will always be oriented perpendicular to the plane in which the rotation occurs Angular Kinematic Quantities Angular Position Displacement Angular Velocity Angular Acceleration Relationship between Linear Angular Motion Copyright 2017 Brian R Umberger Ph D University of Massachusetts Amherst Angular vs Linear Motion real axis imaginary axis Angular vs Curvilinear Motion Rectilinear Motion Angular Motion Angular Motion Curvilinear Motion P1 P2 P1 Curvilinear Motion P3 P2 P3 lines are different lengths lines are the same length 1 Absolute Relative Angles Absolute Relative Angles Absolute Segment Angles Relative Joint Angles Angles measured between the longitudinal axis of a body segment and a fixed reference line Anatomically based angles measured between the longitudinal axes of adjacent body segments Example thigh angle relative to the horizontal Examples knee joint angle elbow angle Measurement Units Measurement Units Angles are typically measured in degrees For some calculations the required unit of measure for angles is the radian One full circle 360 Angles are measured so that counterclockwise motion is considered to be positive Since a radian is a length of the arc divided by a length of the radius a radian is a dimensionless number circumference 2 r Therefore there are 2 radians in a circle 2 Measuring Body Angles Goniometer One arm fixed to protractor at 0 deg Other arm free to rotate Center of goniometer over joint center Arms aligned over longitudinal axes Measuring Body Angles markers placed at segment endpoints segment endpoints are used to define segments and joints Segments Pelvis Trunk Electrogoniometer elgon Hip Thigh Can be used to record joint angles dynamically Knee Inclinometers Leg Provides absolute angles of

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