Finding the force applied on a foot

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Homework Help Overview

The discussion revolves around a physics problem involving forces acting on a person's foot while standing on tiptoes. The scenario includes a person with a mass of 75 kg, experiencing various forces: an upward normal force from the toes, a downward force from the ankle, and an upward force from the tibia. The problem requires determining the magnitudes of the downward and upward forces acting on the foot.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the equilibrium condition of the forces and express uncertainty about calculating the magnitudes of the forces Fa and Fb. There are requests for diagrams to clarify the forces involved and suggestions to consider rotational equilibrium.

Discussion Status

The discussion is ongoing, with participants seeking clarification through diagrams and further exploration of the problem's setup. Some guidance has been offered regarding the need for a free body diagram (FBD) to better understand the forces at play.

Contextual Notes

Participants note that the question is somewhat unclear, indicating a need for additional information or visual aids to facilitate understanding. The problem is framed within the context of equilibrium, but specific details about the forces and their interactions are still being explored.

chris_0101
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So this is the question summarized:
Mass of the person is 75kg, the person is standing on his/her tiptoes. There are three forces acting on the foot which are:
-Upward Normal force from toes - Calculated to be mg=735N (Fn)
-Downward force from ankle onto foot (Fa)
-Upward force from tibia to foot (Fb)

The distances between each point are:
-Distance between toes and ankle is 12.5cm
-Distance from ankle to tibia is 6.5cm

Basically, I have to figure out the magnitudes of Fa and Fb, but I'm not too sure how to complete it.

I do know that it is an equilibrium situation where:

Fa + Fb + Fn = 0

But I do not know how to find Fa and Fb.

The answers of Fa and Fb are 706N and 1073N respectvely.

If anyone could shed some light on this, it would be great.
 
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Can you draw and post a diagram with the forces labeled? I can't quite picture the upward force applied by the tibia...
 
also consider the rotational equilibrium
 
provide fbd as the question is quite unclear
 

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