The Bodys Link System and Its Movement

1
The Bodys Link System and Its Movement

• The Movement of a system within a frame of
  reference

2
Notes on Concept Module B.1 and B.2
3
Definition of SYSTEM

• A body or group of bodies or objects whose motion
  is to be examined it might be an arm, a leg, a
  whole body, a pair of football players, or a
  racket.

4
Definition of FRAME OF REFERENCE

• A stationary environment or one that also is
  moving.
• Examples
• Hand-wrist Segment
• Fixed Bar Chin Up
• Moveable Bar Weights

5
Orientation of the Moving Body In Space

• The orientation of the body is described within a
  spatial frame of reference. Movement of the body
  is then described as being in a direction of
  motion designated as the x direction, the y
  direction and the z direction.

6
The X Direction

• The X Direction is parallel to the ground and
  runs forward and backward relative to the
  performer. Forward is and Backward is -

7
The Y Direction

• The Y direction is parallel to the ground and
  runs right and left relative to the performer.
  The left is and the right is -

8
The Z Direction

• The Z direction is perpendicular to the other
  two. Upward is and downward is -

9
X, Y and Z Directional Examples

• Path of Golf Ball
• Swimmer
• Cyclist foot

10
Types of Motion Exhibited by a System

• Linear Motion
• Rotary Motion

11
Linear Motion

• When a system is forced to move in a path that is
  in a straight line, it exhibits linear motion,
  that is, a change in location from one place to
  another within a spatial frame of reference. If
  a path is straight, it is rectilinear and if the
  path is curved, it is curvilinear. The distance
  (d) that a system moves is called linear
  displacement.

12
Rotary Motion

• If a point within a system is restricted or
  secured so that the system rotates around this
  point when it moves, that point serves as an axis
  of rotation, and the resultant motion of the
  system is called rotary or angular motion. The
  change is location of a rotating body is called
  angular displacement. The distance from the
  point on the rotating segment to the axis of
  rotation is called the points radius of rotation.

13
(No Transcript)