Question

why tools meant for cutting always have sharp edges??​

Answer 1

The smaller the area, larger the pressure on a surface for the same force. This is why tools meant for cutting and piercing always have sharp edges. By increasing the area we can also reduce the pressure on a surface for the same applied force.

Answer 2

Tools meant for cutting always have sharp edges to increase the pressure by increasing the force applied and decreasing the contact surface area.

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