Question

Choose the situation in which pressure due to a given force is decreased through increase in surface area -
a)Sharp knife cuts better than blunt knife
b)Dams have a wide base
c)Iron nails have pointed ends
d)Edge of an arrow​

Answer 1

Answer:

b) Dams have a wide base as a result the water pressure is decreased

Answer 2

B only

• In a the sharp knife cuts better due to decrease the surface area

• Iron nails have pointed ends for decreasing the surface area

• edge of an arrow is sharp because the pressure needs to be increased by reducing the surface area.

• The base of dams is wider because the pressure needs to be decreased so as to protect the dam from breaking due to high pressure

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