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Iwawa48

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Thread moved from the technical forums to the schoolwork forums

**TL;DR Summary:**how to calculate the force exerted by the "tendon" and the resistance occurring on the "tibia" if a 70kg man leans on his tip of the foot.

Hello,

This is the question:

"A 70 kg person stands on the tip of the foot. Assuming a configuration as in Figure 5.6 calculate a) the force P exerted by the

**tendon**; b) the resistance R acting on the

**tibia**; c) the percentage deformation of the

**tibia**, assuming that the section of the

**tibia**is 3.8x10-4m^2 and the Young's modulus is Y=1.6x10^10N/M^2"

This is the image 5.6

This was my reasoning:

I first calculate the weight:

2 W = m* g = 70kg *9.8m/ s = 686N

Remembering that a rigid body is in equilibrium when the results of forces and moments are zero, I write the following conditions:

P is congruent with the result of the exercise, instead R is different; the exercise results in 1372N which by my reasoning is impossible.

What am I doing wrong?

To calculate point c) I would have to apply Hooke's law which depends on the value of R, and of course this result is also wrong.

Thank you and best regards

Gaetano