Question

knife is made with less surface area of contact because​

Answer 1

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Notice that the sharp knife has a very small area of contact with the surface, while the dull knife has a much larger area of contact. If both knives are pushed down with the same force, the sharp knife will exert a much greater pressure on the surface than the dull knife - and pressure cuts.

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Answer 2

Pressure is inversely proportional to surface area.

So, in knife, there is less surface contact.

Hence, the pressure will be more on that region and it can cut things smoothly.