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Mechanical Properties of Fluids
Question
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Why are paper pins and nails made to have pointed ends?

Answer

Pointed paper pins or nails have small area as compared to the blunt one. Lesser the area, greater is the force applied. When force is applied on the pins, they exert large pressure on the surface and hence easily pierce the surface and get penetrated into it. 

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Some More Questions From Mechanical Properties of Fluids Chapter

What is an ideal liquid?

Do liquids exert pressure?

Define pressure.

What is the direction of pressure?

What is the direction in which pressure exerts force on the walls of a container?

What is the SI unit of pressure?

You have two identical glass flasks. One is open mouthed and other is filled with helium and sealed. Which of the two will weigh more?

A cylinder of length l and area of cross section a is filled with liquid of density ρ to a height h. What is the pressure at the bottom due to height column of liquid?