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A knife blade can be considered a type of simple machine known as a wedge. In simple machines, a wedge is used to separate or lift objects by applying force to push them apart. In the case of a knife blade, the sharp edge of the blade tapers to a point, forming a wedge shape. When the blade is pressed against an object with sufficient force and motion, it creates a concentrated area of pressure, allowing it to pierce, cut, or slice through the material.

By applying force to the handle of the knife, the wedge-shaped blade concentrates that force onto a small area, enabling it to penetrate and separate the material being cut. This principle is fundamental to the function of knives and other cutting tools, making them essential for various tasks in cooking, crafting, construction, and many other applications.

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