Is it true that a sharp knife cuts objects more effectively than a blunt knife due to higher force per unit area of the blunt knife?.

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True

False

answer is B.

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Detailed Solution

The above statement is false.
A sharp knife has a very thin edge compared to that of a blunt knife. So, when we cut objects with a sharp knife, the force of the knife falls on a very small area as the edge is extremely thin. It creates a large pressure on the object and cuts the object easily.
On the other hand, in the case of a blunt knife, as the edge is thicker, the force from the knife falls on a larger area, and hence less pressure is created on the object. We know that,

P = \frac{F}{A}

, where

P

is the pressure,

A

is the surface area, and

F

is the force exerted on it. Therefore, cutting the object becomes difficult.
The correct statement would be that a sharp knife cuts objects more effectively than a blunt knife due to the higher force per unit area of the sharp knife.

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