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biomechanics lecture 4
biomechanics lecture 4
43
Anatomy
Graduate
10/07/2014

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Term
define angular kinematics
Definition
mechanical descriptions of angular motions independent of mass
Term
define angular motion
Definition
a rotary movement of an object about an axis of rotation in which all lines of the object move through the same angle during a given time period
Term
what is angular position
Definition
the location of a line in a given angular reference system
Term
what does angular displacement show
Definition
difference between angular positions
Term
what do we care about in displacement?
Definition
beginnng and end position
Term
what don't we care about in displacement
Definition
how we got there
Term
how do we determine the direction of angular displacement
Definition
right hand rule
Term
how does the right hand rule work
Definition
right hand ulnar side shows x axis, palm faces in positive movement direction, thumb shows positive
Term
can you have a non-zero displacement at time 0?
Definition
no. at time 0, displacement = 0
Term
can you have a non-zero position at time 0?
Definition
yes
Term
can you have a non-zero angle at time 0
Definition
yes
Term
how to calculate angular displacement
Definition
difference in angular coordinates between beginning and ending positions
Term
define angular velocity
Definition
the vector quantity that describes the rate of angular displacement with repsect tio time
Term
define angular speed
Definition
the magnitude of angular velocity
Term
how do we determine instantaneous angular velocity?
Definition
approximate the average angular velocity over a very short time period
Term
define angular acceleraation
Definition
vector that describes rate of change in angular velocity
Term
how to calculate average angular acceleration
Definition
change in angular speed or velocity divided by time
Term
how to determine instantaneous acceleration
Definition
average acceleration during a short duration around a given time point
Term
what is a segment angle
Definition
the angle between a segment line and a horizontal reference axis
Term
what are the 2 types of joint angles?
Definition
joint configuration angle, joint movement angle
Term
what is a joint configuration angle
Definition
the angle between 2 articulated segments
Term
what is another name for joint configuration angle
Definition
segment inclination angle
Term
what is the joint movement angle
Definition
the movement of the angle relative to anatomical position
Term
when is the hip joint angle positive
Definition
in flexion
Term
when is the knee joint angle positive
Definition
in flexion
Term
when is the hip joint angle negative
Definition
in extension
Term
when is the knee joint angle negative
Definition
in extension
Term
when is the anke joint angle > 90
Definition
dorsiflexion
Term
when is the ankle joint angle < 90
Definition
plantarflexion
Term
which end is fixed in a closed kinetic chain
Definition
distal
Term
where is the rotational axis in a closed kinetic chain
Definition
in the distal end
Term
what is the moving end in the closed kinetic chain
Definition
proximal
Term
what is the sum of the joint configuration angle and the joint movement angle?
Definition
180 degrees
Term
what is the rotation axis in the closed chain?
Definition
toe
Term
what is the foot angle in the closed chain anatomical position
Definition
180 degrees
Term
what is the shank angle in the closed chain anatomical position
Definition
90 degrees
Term
what is the thigh angle in the closed chain anatomical position
Definition
90 degrees
Term
which end is moving in the open kinetic chain
Definition
distal end
Term
where is the reference line in the open kinetic chain
Definition
through the proximal end of the joint
Term
where is the moving line of the open kinetic chain
Definition
through the distal end of the joint
Term
WHICH ANGLE IS FIXED IN THE OPEN KINETIC CHAIN
Definition
trunk angle
Term
EVERYTHING MOVES ABOUT WHAT JOINT in the open kinetic chain
Definition
hip
Term
when you are standing in the open kinetic chain, where is your rotation axis?
Definition
ankle
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