On what experience can it be shown that the action of force depends on the area of the support?

Nails are driven into the corners of a small board. First, the nails driven into the board are set up on the sand with the points pointed up and a weight placed on the board. In this case, the nail heads are slightly pressed into the sand. And then the board is turned upside down, in this case, the nails go much deeper into the sand. This is because the area of the support has become smaller, and the force acting on the board has been preserved.

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