describing angular movements

Question 1

What are the types of angular motion?

Question 2

what are the cardinal planes and their movements

Answer 2

sagittal plane - rotate around mediolateral axis

frontal plane - rotate around anteroposterior axis

transverse plane - rotate around longitudinal axis

Question 3

What challenges exist when studying angular movements of the human body?

Answer 3

joints often don’t rotate around fixed axis, must estimate. e.g. tib on femur slide a bit.

Question 4

describe a radian

angle/amount in a circle

Answer 4

• all 3 side lengths are equal in a triangle cut out of a circle
• makes a 57.3 degree angle at the axis of rotation
• 6.28 radians in a circle (360/57.3 or 2pi)

Question 5

describe pitch, yaw and roll

Answer 5

pitch - sagittal plane (like a pitcher of beer)

yaw - transverse plane (left/right control of a plane)

roll - rotate along frontal plane

Question 6

difference between angular distance (phi o vertical strike) and angular displacement (theta o horizontal strike)

Answer 6

phi = total distance travelled around arc length

theta = angular displacement

Question 7

difference between angular speed (sigma - o) and angular velocity (omega - w)

Answer 7

sigma = angular distance over time

omega = angular velocity over time. Direction and magnitude included, measured in radians

Question 7

what does the alpha sign mean (looks like “a”)

Answer 7

angular acceleration (change in angular velocity, radians per second)