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Center of Mass

KINE 3301 Biomechanics of Human Movement. Center of Mass. Chapter 12. Segmental Method for Computing Center of Mass. Segment Segment Weight (N ) CM Location (%) Proximal End Head 0.032 x BW + 18.70 66.3 Top of Head Trunk 0.532 x BW – 6.93 52.2 1 ST Cervical

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Center of Mass

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  1. KINE 3301 Biomechanics of Human Movement Center of Mass Chapter 12

  2. Segmental Method for Computing Center of Mass Segment Segment Weight (N) CM Location (%) Proximal End Head 0.032 x BW + 18.70 66.3 Top of Head Trunk 0.532 x BW – 6.93 52.2 1STCervical Upper Arm 0.022 x BW + 4.76 50.7 Shoulder Forearm 0.013 x BW + 2.41 41.7 Elbow Hand 0.005 x BW + 0.75 51.1 Wrist Thigh 0.127 x BW – 14.82 39.8 Hip Lower Leg 0.044 x BW – 1.75 41.3 Knee Foot 0.009 x BW + 2.48 40.0 Ankle From: Chandler, R. F., C. E. Clauser, et al. (1975).

  3. Computing the Location of a Segments CM

  4. How to Use Segmental Method • Determine the X, Y location of the endpoints of all body segments. • Determine the weight of each segment. • Determine the location of each segments center of mass. • Multiply the segment weights by the x or y coordinates and then divide by the total weight to determine the location of the body center of mass.

  5. Using Excel to Compute CM

  6. Sagittal View Example Segment Segment Weight (N) CM Location (%) Proximal End Head 0.032 x BW + 18.70 66.3 Top of Head Trunk 0.532 x BW – 6.93 52.2 1ST Cervical Thigh0.127 x BW – 14.82 39.8 Hip In the back handspring assignment we are assuming that the right and left limbs move symmetrically, so the weights must be doubled, in cell F5 enter the following: =2*((0.127*$L$2)-14.82)

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