Question

Why a sharp knife can cut something than blunt knife also differentiate between density and relative density

Answer 1

hii....

a sahrp knife can cut a fruit but a blunt kinfe can not this is because pressure and area are inverselly proptional to each other . If the area increase the pressure also increase and the area reduces the pressure also reduces.

DENSITY:

• the mass per unit volume is knoen as density.
• its S.I unit is kg/m *3
• density - mass /volume

RELATIVE DENSITY

• the ratio of density of a substance to that of the density of water is called relative density.
• it has no si unit.
• relative density - density of substance / density of water.

hope this helps you....

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Answer 2

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Pressure is inversely proportional to area. Sharp knife has a small area of contact than the blunt knife. Thus, a force will exert more pressure while using a sharp knife than while using a blunt knife.