<Tr> <Th> Cross-sectional shape </Th> <Th> Figure </Th> <Th> Equation </Th> <Th> Comment </Th> </Tr> <Tr> <Td> Rectangle </Td> <Td> </Td> <Td> S = b h 2 6 (\ displaystyle S = (\ cfrac (bh ^ (2)) (6))) </Td> <Td> Solid arrow represents neutral axis </Td> </Tr> <Tr> <Td> doubly symmetric I - section (major axis) </Td> <Td> </Td> <Td> S x = B H 2 6 − b h 3 6 H (\ displaystyle Sx = (\ cfrac (BH ^ (2)) (6)) - (\ cfrac (bh ^ (3)) (6H))) <P> S x = I x y (\ displaystyle Sx = (\ tfrac (Ix) (y))), </P> <P> with y = H 2 (\ displaystyle y = (\ cfrac (H) (2))) </P> </Td> <Td> NA indicates neutral axis </Td> </Tr> <P> S x = I x y (\ displaystyle Sx = (\ tfrac (Ix) (y))), </P>

Difference between moment of inertia and section modulus