What is the correct area to use in a stress calculation for a compressed object?

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In stress calculations for a compressed object, the correct formula is σ = F/A, where A represents the cross-sectional area being compressed. The confusion arises from whether to use A or 2A, but only the area of one side in contact with the force is relevant. The force F is applied uniformly across the area A, leading to the stress being calculated as the force divided by that single area. Understanding that A is the cross-sectional area clarifies the calculation. Therefore, the appropriate approach is to use σ = F/A for accurate stress determination.
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Homework Statement



In a simple mechanics question, which area should be used for a stress calculation? ex. A brick is compressed on 2 sides (opposite to each other) by a given compressive force F. The area of each of the sides being compressed is A.

Homework Equations



σ = F/A

The Attempt at a Solution



I'm just confused if it should be σ = F/A OR σ = F/(2A) and why.
 
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It's just σ = F/A. I forgot that A is cross-sectional area.
 

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