13. If a beam is subjected to a bending moment, what type of stress does it experience? - A) Normal stress - B) Shear stress - C) Tensile stress - D) Compressive stres

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∻Solution∻ ‖ a ⋮ When a beam is subjected to a bending moment, it experiences normal stress due to the internal distribution of forces. The bending moment causes the beam to deform, leading to tensile stress on one side and compressive stress on the other side. Thus, the primary type of stress experienced is normal stress. ‖ ***A*** ∻Answer∻ ⚹ A ⚹ ∻Key Concept∻ ⚹ Bending Stress: When a beam is subjected to a bending moment, it experiences normal stress, which can be tensile on one side and compressive on the other. The stress distribution varies linearly from the neutral axis. The formula for bending stress is given by $$\sigma = \frac{M \cdot c}{I}$$ where $$\sigma$$ is the bending stress, $$M$$ is the bending moment, $$c$$ is the distance from the neutral axis to the outermost fiber, and $$I$$ is the moment of inertia. ⚹ ∻Explanation∻ ⚹ In this case, the beam experiences normal stress due to the bending moment, making option A the correct choice. ⚹

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