Lesson
Angular Kinematic Quantities
Angles:
Relative Angle: an angle at a joint, formed between the longitudinal axis of adjacent body segments
Absolute Angle: angular orientation of a body segment with reference to a fixed line of reference (eg. horizontal, vertical, global reference position)
Angular Distance vs Displacement:
Angular Distance is the sum of all angular changes undergone by a rotating body
Angular Displacement is the change in angular position/orientation of a line segment
Angular Speed vs Angular Velocity:
Angular Speed (a scalar) is the angular distance covered divided by the time taken
Angular Velocity (a vector) is the rate of change in angular position/orientation of a line segment
Angular Acceleration:
Acceleration is a ‘vector’ quantity with both magnitude and direction *
Acceleration is the rate of change in angular velocity ie. change in velocity over a given time
Direction
COUNTERCLOCKWISE direction is POSITIVE*
CLOCKWISE is NEGATIVE*