Chapter 6 - Angular Kinematics Flashcards
Define relative angular position
Relative angular position is when the other line or plane is capable of moving
Define absolute angular position
Absolute angular position is when the other line or plane is fixed
What is the difference between relative and absolute angular position?
In relative angular position, the line or plane is capable of moving, in absolute angular position, the line or plane is fixed (not capable of moving)
Define angular displacement
The change in angular position experienced by a rotating line
Define average angular velocity
Average angular velocity is computed as the change in angular position (angular displacement) divided by time
Define instantaneous angular velocity
Instantaneous angular velocity is an indicator of how fast something is spinning at a specific instant in time (Tachometer in car measuring in revolutions per minute)
Define average angular acceleration
Average angular acceleration is computed as the change in angular velocity divided by time
Define instantaneous angular acceleration
Instantaneous angular acceleration is defined as the rate of acceleration of an object rotating at a certain point, or instance in time.
Name the units of measurement for angular position, displacement, velocity, and acceleration (7)
Degrees, revolutions, radians, metres, rad/s, rev/min (rpm), rad/s², °/s²
Explain the relationship between linear speed and angular velocity
The average linear speed of a point on a rotating object is equal to the average angular velocity of the object times the radius
Describe the anatomical position
Standard reference position, palms up
Define the three principal anatomical planes of motion and their corresponding axes
Sagittal plane rotates around transverse axis
Frontal plane rotates around anterior-posterior axis
Transverse plane rotates around longitudinal axis
Describe the joint actions that can occur at each of the major joints of the appendages
Elbow flexion
Leg abduction
Rotation of head
