Question

why the tools meant for cutting and piercing always have sharp edges

Answer 1

Tools meant for cutting and piercing have sharp edges because they have less area of contact and can apply more pressure while cutting and cutting becomes easier as surface area is less more pressure will be applied on object.

Answer 2

Answer:

the tools meant for cutting and piercing always have sharp edges because the more the surface area the less the pressure and the less the surface area the more the pressure. We will need more pressure to cut and pierce objects that is why the tools meant for cutting and piercing have sharp edges.

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