A sharp knife cuts better than a blunt knife. Which of the following options is/are correct?

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Blunt knife has a greater surface area in comparison to a sharp knife.

Sharp knives are usually made of silver which has more strength.

A sharp knife applies more pressure by virtue of its smaller contact surface.

Both 1 and 3

answer is D.

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Detailed Solution

The correct option is 4.
We know that pressure is defined as the force acting per unit area. A sharp knife has less surface area than a blunt knife. So, a sharp knife applies greater pressure when used for cutting. This is why it cuts better. On the other hand, a blunt knife has a greater surface area and hence applies less pressure. A sharp knife cuts objects easily because, due to its very thin edge, the force of our hand falls on a very small area of the object producing large pressure.

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