Just to muddy the waters a little more, some woods will shatter rather than absorb the impact too. I've noted this is often true of the exceptionally hard woods.
And then there's moisture content to throw in - green/wet wood has more of a dampening effect than seasoned wood.
Not enough factors yet? How about temperature? Sub-zero and you could end up with ice crystals within the fibres and cells making the wood even more brittle than usual.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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