bioe119-fall94-final-Keaveny-exam

# bioe119-fall94-final-Keaveny-exam - ME 176 Final Exam, Fall...

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ME 176 Final Exam, Fall 1994 Name: ______________________________ Page 1 of 9 Wednesday, December 15, 12:30–3:30 PM, 1994. Write all answers in the space provided. If you need more space, write on the back sides. Indicate your answer as clearly as possible for each question. Write your name on the top of each page as indicated. 1. (10 points) Forces and Moments at Joints Figure 1 depicts a schematic of the proximal femur with the joint contact J and abductor A forces shown, during the single legged stance phase of gait. Show, with your own free-body diagram analysis, why the angle b must always be greater than angle a . Figure 1

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ME 176 Final Exam, Fall 1994 Name: ______________________________ Page 2 of 9 2. (15 points) Dynamics of Human Motion Figure 2 depicts a schematic of the shank (knee-ankle segment of the leg), at an angle q to the horizontal, that can be used to compare the resultant moment about the knee joint for heel-strike vs. the swing portions of gait. For the following two cases, draw a free-body diagram showing all loads and accelerations and write out the equation of rotational equilibrium as specified below. In each case, ignore the mass of the foot, model the shank as a uniform bar of length L and mass m , and include all relevant inertial (acceleration) terms. Label clearly your free-body diagrams and all inertial terms, particularly the moment- of-inertia terms. For loads, show resultant joint reaction forces and moments (as opposed to joint contact and muscle forces).
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## This note was uploaded on 09/16/2009 for the course BIO ENG 119 taught by Professor Keaveny during the Spring '09 term at University of California, Berkeley.

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bioe119-fall94-final-Keaveny-exam - ME 176 Final Exam, Fall...

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