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

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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 x BW Top of Head Trunk x BW – ST Cervical Upper Arm x BW Shoulder Forearm x BW Elbow Hand x BW Wrist Thigh x BW – Hip Lower Leg x BW – Knee Foot x BW Ankle From: Chandler, R. F., C. E. Clauser, et al. (1975).

Computing the Location of a Segments CM

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. 𝑥 𝐶𝑀 = 𝑚 1 𝑥 1 + 𝑚 2 𝑥 2 + 𝑚 3 𝑥 3 … 𝑚 1 + 𝑚 𝑚 3 … 𝑦 𝐶𝑀 = 𝑚 1 𝑦 1 + 𝑚 2 𝑦 2 + 𝑚 3 𝑦… 𝑚 1 + 𝑚 𝑚 2 …

Using Excel to Compute CM

=2*((0.127*\$L\$2)-14.82) Sagittal View Example
Segment Segment Weight (N) CM Location (%) Proximal End   Head x BW Top of Head Trunk x BW – ST Cervical Thigh x BW – 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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