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| Fig. 6.5a-b: Surface, S, separates two parts of a body (Fung, 1969). a) At point P part 2 exerts a traction t[n(1)] on part 1. b) At point P part 1 exerts a traction t[n(2)] on part 2. These two tractions are equal in magnitude and oppositely directed. | ||||
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