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### What is the theory behing why is it harder to bend a block of wood on its thinner side when load is put onto it

Notice also that the strength of wood is anisotropic: the grain structure of the wood makes it stiffer in one orientation (called "vertical grain") and far more flexible in another (the &...
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1 vote

### What is the theory behing why is it harder to bend a block of wood on its thinner side when load is put onto it

It is covered by the general beam theory. The deflection equation for a simply supported beam with a concentrated load in the mid-span is $\delta = \frac{FL^3}{48EI}$. Since $L$ (length) and $E$ (...
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