old_exams_2 - ME 577 Spring 2009 Exam 2 1. Consider a sit...

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ME 577 – Spring 2009 Exam 2 1. Consider a sit up (with the back kept straight). The exerciser starts with their back on the ground and raises up. Draw a free body diagram when the exerciser is making a 45 o angle with the horizontal to evaluate the forces at the L3 level. Which muscle group dominates? (8 points)
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2. During the pull stroke demonstrated below, determine whether each of the following joints flex or extend: knee, hips, elbows. Which muscle groups are primarily responsible for each motion? (8 points) Knee Hips Elbows http://www.crossfit.com/journal/library/50_06_Rowing_Technique.pdf Additional references at: http://www.culver.org/students/sports/crew/rowingstroke.asp
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3. Short answer (10 points): Please list the principle functions of the bones in the skeleton. Where do you find cartilage in a diarthroidal joint and what is its function? Tendons attach what to what? Ligaments attach what to what? Which bone does the patella articulate with? Where might you find cancellous bone in the human skeleton?
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4a. First, consider a static analysis of an adult picking up a 30 lbs. child and holding the child at arm’s length (approximately 2.5 ft. from the shoulder). Assuming the shoulder lines up with the vertical axis of the spine, and the distance from the vertebral body to the erector spinae muscle is 2 inches behind the spine, calculate the compressive and shear loads on the spine as well as the
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old_exams_2 - ME 577 Spring 2009 Exam 2 1. Consider a sit...

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