chapter 6 Flashcards
description of angular motion
all points move in a circular path about the same axis
4 descriptors of angular motion
how far, direction, how fast, speeding up or down
angle
intersection of two lines, planes, or line and plane
1 rad= ___degrees
57.3
the orientation of a line with another line or plane
angular position
absolute angular position
one line or plane is fixed and immovable relative to the earth
orientation of a body part to the horizontal or vertical
relative angular position
both lines or planes are capable of moving
joint angle
are joints measured with relative or absolute angular positions
relative
right hand rule
align right thumb with axis of rotation in positive direction, fingers of right hand curl in the + direction of rotation
elbow flexion with the right arm is in the ___ direction
+, counterclockwise
elbow flexion with the left arm is in the ___ direction
-, clockwise
axis of rotation is always perpendicular to
plane of motion
R wrist flexion + or -
+
R wrist extension + or -
-
R elbow flexion + or -
+
R elbow extension + or -
-
when a segment rotates, a point ____ the axis of rotation travels a greater linear distance than a point ____the axis
further
closer
rate of change of angular position
how fast the body is rotating
instantaneous angular velocity
rate of rotation at an instant in time
velocity is vector or scalar
vector
tangential linear velocity of a rotating body
magnitude:
direction:
wr
tangent to the circular path of a rotating point
tangential linear velocity
how fast an in what direction the point is moving at an instant in time
speeding up/starting:
angular acceleration is in the direction of
angular motion
slowing down/stopping:
angular acceleration is in the direction
opposite of angular motion
