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Unformatted text preview: point approximately 9 cm from the center of the humeral head. For simplicity, assume that it always makes an angle of 10 o with the long axis of the humerus. The weight lifter raises a weight with a mass of 30 kg. 4a. Draw a free body diagram (single force no moment assumption). 4b. Write out the equations of motion that govern the system. 4c. Calculate the acceleration of the center of mass. 4d. If the mass of the arm is 8 kg, determine the systems moment of inertia relative to the center of the humeral head. 4e. Determine the contact forces in the shoulder and the muscle forces in the deltoid. ! ( t ) = " 4 1 # cos t T $ % & ' ( ) $ % & ' ( ) 5. In class we considered what happens to the force in the PCL when someone is kneeling or drops to their knees. Draw a better free body diagram than the one we developed in class. If we could only add one additional muscle or ligament to the problem, which one would it be?...
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This document was uploaded on 12/21/2011.
 Fall '09

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