Stress is fundamentally defined as_________________?
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Answer: C. Force per unit area
Explanation
The correct answer confirms that stress is fundamentally defined as internal restoring force per unit cross-sectional area. External loads applied to a body generate internal resistance distributed across internal areas to maintain static equilibrium. Dividing total internal force by the cross-sectional area yields the average stress intensity at that section. Stress is a fundamental concept in mechanics of materials used to evaluate structural safety and material integrity. Force is measured in Newtons, and cross-sectional area is measured in square units of length. Distributed internal forces resist external pulling, pushing, or shearing actions applied to structural members.
Force per unit length describes line loads or spring stiffness constants rather than cross-sectional material stress. Force per unit volume corresponds to body forces like gravity or magnetic attraction rather than surface stress. Rejecting force per area ignores the basic physical definition established in mechanics of materials.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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