When a person stands on tiptoe on one foot (a strenuous position), the position

Question

When a person stands on tiptoe on one foot (a strenuous position), the position of the foot is as shown in Figure (a). The total gravitational force F with arrowg on the body is supported by the normal force n with arrow exerted by the floor on the toes of one foot. A mechanical model of the situation is shown in Figure (b), where T with arrow is the force exerted on the foot by the Achilles tendon and R with arrow is the force exerted on the foot by the tibia. Find the values of T, R, and when Fg = 635 N. (Do not assume that R with arrow is parallel to T with arrow.)

T = ? N R = ? N ? =? 3 When a person stands on tiptoe on one foot (a strenuous position), the position of the foot is as shown in Figure (a). The total gravitational force F with arrowg on the body is supported by the normal force n with arrow exerted by the floor on the toes of one foot. A mechanical model of the situation is shown in Figure (b), where T with arrow is the force exerted on the foot by the Achilles tendon and R with arrow is the force exerted on the foot by the tibia. Find the values of T, R, and I-hat when Fg = 635 N. (Do not assume that R with arrow is parallel to T with arrow.)

Explanation / Answer

Sum vertical force components: ?Fy = T*cos? - R*cos15

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