Designed by
Title
The magnitude equal to the strength of the active perpendicular surface to the area of this surface is called pressure. #169474747
Description
Nails are hammered into the corners of a small board. First, the nails, hammered into the board, set on the sand with the edges up and put on the board weight. In this case, the nails` hats are pressed into the sand slightly. Then the board is turned over and put nails on the edge. In this case6 the area of support is smaller, and under the influence of the same force nails are much deeper into the sand.