Tension and compression forces on a femur bone

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SUMMARY

The discussion focuses on the analysis of tension and compression forces acting on a femur bone, specifically addressing the calculation of stress in N/m² (Pascals). Participants clarify that the moment should be calculated as the force multiplied by the moment arm, emphasizing the need to solve axial stress and bending stress using their respective equations. Additionally, the use of N*mm^-2 is validated as MPa, provided that unit tracking is maintained throughout the calculations.

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mishelhad
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Summary:: Hello all,
I need help with this question, ill attach the equations i managed to solve.
How do i continue from there?

Screenshot_20210617-003639_Samsung Notes.jpg
Screenshot_20210617-003639_Samsung Notes.jpg
IMG-20210616-WA0024.jpg
 
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The stress should be expressed as N/m^2.

I have no idea how you determined the moment, but it certainly is not determined by the equation that you employed. It should be the force times the moment arm.
 
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Looks like they found the axial stress and set it equal to the bending stress, which is incorrect. They should each be solved for by their respective equations.

I don't think there's anything inherently wrong with N*mm^-2, which is MPa, as long as the units are properly tracked. That said, the final answer doesn't even have any units with it.
 

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