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Which of the following is NOT true of the section modulus?

  • A.It has units of length to the fourth power
  • B.It equals the second moment of area over the extreme fibre distance
  • C.It gives the maximum stress when divided into the applied moment
  • D.It allows sections to be compared directly

Answer: A

Correct answer: It has units of length to the fourth power

The section modulus is \( I/y \), which is length to the fourth divided by length - so its units are length cubed. That is precisely what makes it a modulus rather than a second moment, and it is why dividing the applied moment by it gives a stress.

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