Pressure is the amount of force pushing on a certain area. For a certain area, the bigger the force, the bigger the pressure. For a certain force, the bigger the area, the smaller the pressure.

If a thumb is putting a force onto the head of a pin. The force is transferred to the point of the pin. The point has a very small area, so there is a very large pressure on the board, and the pin goes in.

If the thumb is putting a force directly on the board. The area of the thumb is much larger than the area of the pin point, so there is only a small pressure on the board. The thumb does not go into the board.

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