6. Angular Motion: Terms & Definitions

Question 1

Absolute Angle

Answer 1

the space between a body segment and a fixed line of reference

Question 2

Anatomical Position

Answer 2

erect

Question 3

Angular Acceleration

Answer 3

The change in angular velocity, a vector qunatity represented by α

Question 4

Angular Distance

Answer 4

Scalar quantity used to measure the total rotation, measure using phi φ

Question 5

Angular Displacement

Answer 5

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)

Question 6

Angular Motion

Answer 6

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.

Question 7

Angular Speed

Answer 7

angular distance / time
scalar
represented by sigma σ

Question 8

Angular Velocity

Answer 8

angular displacement / time
vector
represented by omega ω

Question 9

Axis of Rotation

Answer 9

The axis of rotation is the imaginary line or point around which an object rotates or spins.

Question 10

Cardinal Planes

Answer 10

Planes that intersect the body at the centre of mass

Question 11

Clockwise Rotation

Answer 11

rotation in the clocwise direction, seen as negative

Question 12

Counterclockwise Rotation

Answer 12

rotation in the counterclocwise direction, seen as positive

Question 13

Degree

Answer 13

arbiutary unit of measuemnt

Question 14

External Angle

Answer 14

angle formed on the surface of a joint

Question 15

Goniometer

Question 16

Instant Center

Answer 16

a point on a system where the axis of rotation is perceived to be

Question 17

Internal Angle

Question 18

Pitch

Answer 18

movement of head up and down, movement in the saggital plane around a medial-lateral axis

Question 19

Radian

Answer 19

57.3º or 2π rad = 360º

the ratio of the length of the arc of a circle to the radius of the circle

Question 20

Relative Angle

Answer 20

the space between two longitudal axis of adjacent segments

Question 21

Revolution

Question 22

Roll

Answer 22

tilting of head left or right, movement in the coronal plane around a anterior-posterior axis

Question 23

Rotation

Answer 23

circular motion around a fixed axis of rotation

Question 24

Yaw

Answer 24

left and right rotation around a vertical axis and the transverse plane