When standing on loose sand, the thrust (or weight) is acting on a smaller area (the area of your feet), causing a greater impact on the sand. When lying down, the same thrust is distributed over a larger area (the ...
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Thrust is the force acting on an object perpendicular to the surface.
Weight is the force acting vertically downwards due to gravity.
The concepts of net force in a particular direction (thrust) and force per unit area (pressure) help explain these phenomena, as they relate to how force is distributed over an area.
Cutting tools have sharp edges to concentrate the force applied over a smaller area, increasing the pressure and making it easier to cut through materials.