So if we remember, force = mass x acceleration (f=ma)... therefore when a given mass has a higher negative acceleration (comes to a stop faster), the negative force that must be absorbed by the knees (which is a constant and not dependent on board size) is higher as well.
That’s why I would have though that a smaller board would come to a stop in a bit more time due to allowing it to sink in the water a bit, thus reducing the negative acceleration slightly. And hence the force that must be absorbed by the knees.
Let’s take it to a different extreme - say you land with a board that is 1/4 the size or even no board (ie, wakeskate that falls away). The vertical force on the knees would be way way less. The lateral force would be far greater though as you try to keep moving forward due to the drag from sinking in the water.
Anyway, there must be something else that is causing the greater cushioning effect from a larger board because surface area alone should make it the opposite effect.
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