As knife have less number of atoms and that's why it can seperate the atoms of material by dugging into the space between then easily

Introduction:
A sharp edge blade is more effective in cutting than a blunt blade due to a small contact area. This means that the sharp edge blade has a smaller surface area in contact with the material being cut. Let's explore why this is advantageous in cutting.

Explanation:
When a blade is sharp, it has a thin edge that comes into contact with the material being cut. This results in a smaller contact area between the blade and the material. This small contact area allows for concentrated force to be applied to a specific point, making the cutting process more efficient and effective.

Key Points:
Here are the key points explaining why a small contact area of a sharp edge blade is more effective in cutting:

1. Concentrated Force: With a sharp edge, the force applied is concentrated on a smaller area of the material. This concentrated force allows for easier penetration and separation of the material, making the cutting process quicker and more efficient.

2. Reduced Friction: A smaller contact area also means reduced friction between the blade and the material. When the blade has less surface area in contact with the material, there is less resistance to the cutting motion. This reduces the amount of force required to cut through the material.

3. Precision: The small contact area of a sharp edge blade allows for more precise cutting. It enables the blade to follow a specific path and cut through the material with greater accuracy. This is particularly important when cutting delicate or intricate shapes.

4. Less Material Deformation: When a blunt blade is used, a larger contact area results in more material deformation. The pressure is distributed over a larger area, causing the material to be compressed or pushed aside rather than cut cleanly. In contrast, a sharp edge blade with a small contact area minimizes material deformation and produces a cleaner cut.

5. Efficiency: Due to the concentrated force and reduced friction, a sharp edge blade requires less force and energy to cut through a material. This makes the cutting process more efficient, saving time and effort.

Conclusion:
In summary, a sharp edge blade with a small contact area is more effective in cutting due to its ability to concentrate force, reduce friction, provide precision, minimize material deformation, and improve efficiency.