6. Angular Motion: Terms & Definitions Flashcards
Absolute Angle
the space between a body segment and a fixed line of reference
Anatomical Position
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Angular Acceleration
The change in angular velocity, a vector qunatity represented by α
Angular Distance
Scalar quantity used to measure the total rotation, measure using phi φ
Angular Displacement
vector quantity that measures the shortest angular distance between the starting and ending position of an object’s rotation, represented by the symbol θ (theta)
Angular Motion
Angular motion refers to the rotation of an object around a fixed axis, where all points on the object move in circular paths centered on that axis.
Angular Speed
angular distance / time
scalar
represented by sigma σ
Angular Velocity
angular displacement / time
vector
represented by omega ω
Axis of Rotation
The axis of rotation is the imaginary line or point around which an object rotates or spins.
Cardinal Planes
Planes that intersect the body at the centre of mass
Clockwise Rotation
rotation in the clocwise direction, seen as negative
Counterclockwise Rotation
rotation in the counterclocwise direction, seen as positive
Degree
arbiutary unit of measuemnt
External Angle
angle formed on the surface of a joint
Goniometer
Instant Center
a point on a system where the axis of rotation is perceived to be
Internal Angle
Pitch
movement of head up and down, movement in the saggital plane around a medial-lateral axis
Radian
57.3º or 2π rad = 360º
the ratio of the length of the arc of a circle to the radius of the circle
Relative Angle
the space between two longitudal axis of adjacent segments
Revolution
Roll
tilting of head left or right, movement in the coronal plane around a anterior-posterior axis
Rotation
circular motion around a fixed axis of rotation
Yaw
left and right rotation around a vertical axis and the transverse plane
