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Transcript

  • 1. Center of Mass
  • 2. CoM & CoG
    Center of Gravity
    • A point at or near the object through which the resultant weight of the object passes
    Center of Mass
    • point at which the object's mass can be assumed, for many purposes, to be concentrated
  • COM
    • The point around which a body’s weight is equally balanced in all directions
    • 3. Also referred to as the center of mass or mass centroid
    • 4. Need not be physically located inside of a body
  • Center of Mass
    • Specific point at which a system of particles behaves
    • 5. a concentrated system
    • 6. a function of only the positions and masses of particles comprising a system.
  • 7. a) Neutral
    b) Stable
    c) Unstable
  • 8.
  • 9. Center of Gravity
    Serves as an index of total body motion
    By locating CM can analyze motion of the entire system as distinguished from the motion of its individual parts
    Path of the center of gravity of a runner.
  • 10. Methods to assess CG
    Reaction Board technique which is easily applied to static positions
    Balance Board technique which has limited application and is used for static positions
    Segmentation method involves an estimation of individual segment masses and positions
  • 11. Balance Board Technique
  • 12. Reaction Board Technique
  • 13.
    • Position of the end points of all of the body’s segments
    • 14. Mass of each segment
    • 15. Location of CoM within each segment
    Segmental Method
  • 16.
    • 14 body segments:
    • 17. Trunk
    • 18. Head and neck
    • 19. Right and left thighs
    • 20. Right and left lower legs
    • 21. Right and left feet
    • 22. Right and left upper arms
    • 23. Right and left lower arms
    • 24. Right and left hands
    • 25. Each segment has its own CoM
    Segmental Method