Question

3. The cutting edge of cutting instruments is
sharpened because, by
the
area of cross-section, the
increases.
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Answer 1

Answer:

All cutting instruments such as blades, axes, etc. are sharpened so that the area of cross-section decreases and hence pressure exerted by them increases. Thus, they can easily penetrate a given surface.

Answer 2

Answer:

the smaller the are of impact, the more the pressure

Explanation:

pressure=force/are

while sharpening instruments, the are decrease hence increasing the pressure, which enables smooth cutting