Does Dragonglass kill White Walkers on contact, or does there need to be some force behind it as if it were a "regular" weapon?

The question I have driving this one is, in the Battle of Winterfell, could they have basically shattered all the Dragonglass in to little bits, and sprinkle it over the White Walkers/Night King, effectively killing them? Or would they still have to be forcefully impaled with it to kill them?

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