The diagram shows the right foot of a 120 lb person standing on \"tip-toe.\" The

Question

The diagram shows the right foot of a 120 lb person standing on "tip-toe." The tension in the Achilles tendon T makes an angle Alpha = 57 Degree with the horizontal. Neglecting the weight of foot (W_F = 0), compute the tension in the Achilles tendon and the magnitude and direction of the reaction force R at the distal end of the tibia. Repeat part A, but include the weight of foot (using the anthropometric data for the Standard Human). Assume the foot's center of gravity is 2 inches below the end of the tibia. Compare the answers in parts A and B. What percent error is introduced by omitting the foot weight? Is it reasonable to neglect the foot weight for this analysis?

Explanation / Answer

a) T = 118.2 lb, R = 171.7 lb, = 68.0 down from the horizontal

b) T = 118.2 lb, R = 170.1 lb, = 67.8 down from the horizontal

c) percent error in R is 0.95%, percent error in is 0.32%

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