What does FS stand for?

• A. Friction Factor
• B. Fail Safe
• C. Factor of Safety
• D. Frame of Safety

Answer: (C)

Factor of Safety is the idea being tested. It expresses how much stronger a component or structure is compared to the loads it is expected to carry, providing a safety margin in design. It’s calculated as the strength of the part (often its yield or ultimate strength) divided by the expected design load. This yields a dimensionless ratio: a larger value means more margin against failure. For example, if a part can withstand 1000 N before failing and the service load is 400 N, the Factor of Safety is 2.5. While a higher factor increases safety, it can also add weight or cost. The other terms aren’t the standard way engineers use FS: friction factor relates to flow resistance, and fail-safe refers to a system continuing to operate safely after a component fails, not the design margin. Frame of Safety isn’t a conventional term in this context.