wiki- Friction Resistance

Definition: The cutting resistance a knife encounters when passing through food, caused by friction between the blade surface and the ingredient.
Details: Friction resistance directly influences sharpness and ease of cutting. It depends on several elements including blade angle, thickness, grind shape, and surface finish. For example, polished or convex blades often reduce friction, while thicker or steeper edges increase resistance.
Comparison: Knives with a narrow blade angle and thin cross-section experience less friction, making them ideal for precision tasks like sashimi slicing. Conversely, thicker blades with wider angles provide durability but generate more resistance, making them better suited for tough ingredients.
Practical Use: Optimal blade thickness near the edge—around 0.45 to 0.55 mm at ~3 mm from the edge—maintains balance between sharpness and durability. Adjusting the grind and finish can tailor performance for different foods, from delicate vegetables to dense meats.
Cultural Note: In Japanese craftsmanship, minimizing friction resistance is closely tied to achieving “smooth, beautiful cuts” (kireaji). This reflects the philosophy that a knife should not only cut efficiently but also preserve the integrity and presentation of ingredients.

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