Our feet are dramatically under appreciated. They make it possible to walk, run,

Question

Our feet are dramatically under appreciated. They make it possible to walk, run, kick and jump - transmitting very large forces the entire time. Here we show foot contact with the ground while walking. At this instant, you may assume that the ground pushes up vertically at the point O, with a force of 1.15 times body weight. The angle gamma is 65 and the angle alpha is 20 degrees. Replace the angle with a pin joint and assume that x1 = 5.5 in and x2 = 1.5 in. Then determine the force in the Achilles tendon (F1 in the figure) relative to body weight. http://web.ics.purdue.edu/~krousgri/me270/?p=3522 = picture

Explanation / Answer

The vertical distance from the ankle to the heel was not given in the problem. For this distance you can either measure it on yourself , or you can use 0.75?. Make sure to state in your assumptions that you assumed that distance

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