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Multiple Choice

What type of stress pulls metal apart?

When metal is pulled apart, the force is applied along its length, creating tensile stress. This normal stress acts to elongate the material, pulling it longer as the internal bonds resist the pull. As the load increases, the metal stretches until it reaches its tensile strength and eventually breaks. Torsional stress comes from twisting, compressive stress from pushing inward, and shear stress from parallel forces sliding layers past each other. The key idea here is that pulling apart along the length directly corresponds to tensile stress, which is why that option is the best choice.

When metal is pulled apart, the force is applied along its length, creating tensile stress. This normal stress acts to elongate the material, pulling it longer as the internal bonds resist the pull. As the load increases, the metal stretches until it reaches its tensile strength and eventually breaks.

Torsional stress comes from twisting, compressive stress from pushing inward, and shear stress from parallel forces sliding layers past each other. The key idea here is that pulling apart along the length directly corresponds to tensile stress, which is why that option is the best choice.