09/06/2026
Utilizing Centrifugal Force and Weight via the "Monouchi"
Samurai swords feature a section called the **"monouchi"** (generally located a few inches to over 10 centimeters below the tip), which is designed to cut through objects most efficiently.
When the sword is swung with proper form, the sword’s own weight and centrifugal force are concentrated most intensely in this **"monouchi"**. In other words, rather than forcing the blade into the target with one’s own muscle strength, the mechanism allows the sword’s kinetic energy to be transferred directly to the target, causing the blade to sink in on its own.