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Chapter 9: Q1 E (page 506)

Why are sharp knives more effective than dull knives (Hint: think about the definition of pressure)?

Short Answer

Expert verified

Because the area of a sharp knife is less than that of a dull knife, the pressure, or force/area, will be greater for the sharp knife. As a result, they are more efficient.

Step by step solution

01

Definition of pressure

Pressure is known to be the ratio between force and area.

02

Explanation

Sharp knives have a much smaller surface area than dull blades, hence the pressure (Force/Area) exerted for the same applied force is higher for sharp knives than for dull knives. As a result, they are more efficient.

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