Rotation Flashcards
Angular kinematics definition
- Motion of a body about an axis of rotation
- all points on body go through the same angle
What is general motion?
linear and angular motion combined (linear produced by angular)
Angular motion definition
A series of angular rotations to produce linear motion eg tennis serve or hammer throw
How do different body positions influence resistance to rotation about axes
They change them dependant on the body position
Angular distance definition
how far a body rotates around an axis
Angular displacement definiton
change in position around an axis
Radians (unit) definition
A measure of an angle at the centre of a circle whereby the length of the arc is equal to the length of the radius of the circle
How many degrees in one Radian?
57.3 degrees (360 / 2pi)
what is the Right hand rule
Right hand thumb up = (positive fingers rotate anti clock wise)
Thumb down = negative (fingers rotate clockwise)
how to calculate angular speed
angular distance / time
how to calculate velocity
change in angular position / change in time
what are the 3 units of angular velocity?
degrees/s, radians/s, rev/s
how to calculate angular acceleration
rate pf change of angular velocity / change in time
squared units
What is an absolute angle
angle of inclination of a body segment relative to a fixed reference in the environment
eg angle from line from knee/hip
what is an relative angle
angle between longitudinal axes of two segments (joint angle)
eg elbow, knee
