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