bioe119-Fall2001-mt1-Keaveny-exam - ME/BIOE C176 Mid-Term...

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ME/BIOE C176 Mid-Term Exam, Fall 2001 Name: ______________________________ Wednesday, October 10, 9:30–11:00 AM , 2001. Please write all answers in the space provided. If you need additional space, write on the back sides. Indicate your answer as clearly as possible for each question. Write your name at the top of each page as indicated. ______________________________________________________________________________ 1. (20 points total) Forces and Moments at Joints Fitness instructors often recommend doing different types of sit-ups to tone the abdominal muscles, although some exercises may be more strenuous on the lower spine. Two common types of sit-ups are the leg-raised sit-up and the crunch. In the first case, you start by lying fully flat on your back, legs straight and arms by your side. Then, you slowly raise your legs just slightly off the ground. In the second case (the crunch), you start from the same initial position, but instead of raising your legs you raise your shoulders and head off the ground, slowly and just slightly. The question is, how do these different types of sit-ups affect the magnitude of the joint contact force on the L2 vertebral body? Express your answer as the ratio of the joint contact force (in terms of body weight) acting on L2 when
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This note was uploaded on 02/17/2010 for the course BIOE 100 taught by Professor Budinger during the Spring '10 term at University of California, Berkeley.

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bioe119-Fall2001-mt1-Keaveny-exam - ME/BIOE C176 Mid-Term...

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