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Traction T at a point on a surface is defined as:
A{'text': 'Total force on the body', 'label': 'A'}
B{'text': 'Weight of the body', 'label': 'D'}
C{'text': 'Stress integrated over the surface', 'label': 'C'}
D{'text': 'The limit of dF/dS — force per unit area at that location on the surface', 'label': 'B'}
Answer & Solution
Correct answer: D. {'text': 'The limit of dF/dS — force per unit area at that location on the surface', 'label': 'B'}
Traction is a vector quantity: $\mathbf{T} = \lim_{\Delta S \to 0} \Delta\mathbf{F}/\Delta S = d\mathbf{F}/dS$. It depends on the surface orientation (normal direction) — making it a "bound vector".
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