5 - Angular Motion Flashcards
What is angular motion?
movement around a fixed axis of rotation e.g high jump, hammer throw, gymnastics
Why does angular motion occur?
due to force being applied that does not go through the centre of mass
What are the three types of angular motion?
Rotation about the point of contact
Rotation about the centre of mass
Rotation of body segments about their joint centres
What are the planes of motion?
Sagittal, Horizontal, Frontal
What is 1 radian?
The angular distance covered when the arc length equals the radius
If it is a rigid segment, how are angular and linear displacement affected?
angular displacement will be the same
linear displacement will be different
What are the two types of angles?
Absolute and Relative
What is an absolute angle?
The angle of a body segment relative to a fixed reference
Describes the orientation of a body in space
What is the relative angle?
Defines the angle between longitudinal axis of two adjacent segments
Describes the configuration of the body segments but does not define the position of the segments space
How can range of motion be measured?
Difference between max and min joint angles
What happens if anatomical range of motion is exceeded?
Injury
During the vertical jump, what is the angle change for the hip, knee and ankle?
Knee = 90 Hip = 90 Ankle = 20/30
During the squat, what is the angle change for the hip, knee and ankle?
Knee = 90 Hip = 90 Ankle = 60
Describe the range of motion in running vs walking
Running has a greater range of motion than walking
How much movement is considered to be outside of the sagittal plane in sprinting?
Very little
