Biomechanics (BE 202)

Homework #2 (100/100) Due date: 2/16/2016 1 1. (20pts) Consider a person’s arm shown below. When a vertical (y-directional) force is applied to the hand (H), estimate the moment at the elbow (E) and shoulder (S) produced by this force. (Here, xy: frontal plane, yz: sagittal plane, and xz: transverse plane) 2. (30pts) As illustrated below, force F is applied to a block on a point P. The application point of the force, P, can be any point on the edge AB. (a) (15pts) Find the moment vector at O produced by the force F. (b) (5pts) Find the location of the point P (i.e., determine x value) where the moment about x axis (Mx) is minimized. (c) (5pts) Find the location of the point P where the moment about y axis (My) is minimized. (d) (5pts) Find the location of the point P where the moment about z axis (Mz) is minimized. Biomechanics (BE 202) Homework #2 (100/100) Due date: 2/16/2016 2 3. (20pts) Determine the net moment about the hip joint (H) produced by the weight attached to the ankle (A). 4. (30pts) A person is pulling a weight as shown below. His shoulder joint is not moving, but his elbow joint is free to rotate; (a) (15pts) Calculate the moment at the elbow joint (E) produced by the weight. In other words, represent the elbow moment ME as a function of the elbow flexion angle ?. (b) (15pts) Find the elbow angle ?max where the magnitude of the moment about the elbow joint (??????) is maximized.