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When too many people stand on a bridge it collapses, why?

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in Engineering Physics I by (558k points)
When too many people stand on a bridge it collapses, why?

(a) Due to increase in stress

(b) Due to overweight

(c) Due to improper construction

(d) Due to friction

I got this question in an interview for internship.

The question is from Elasticity topic in portion Thermal Properties of Matter of Engineering Physics I

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The correct choice is (a) Due to increase in stress

To elaborate: Stress is the force per unit area experienced by the body and strength is the ability to withstand the stress. When stress becomes greater than strength, accidents happen.

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