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Mechanical Properties of Fluids
Question
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To keep a piece of paper horizontal you should blow over, not under it. Why?

Answer

When we blow the air above a piece of paper, velocity of air above paper increases and hence the pressure above the piece of paper decreases.
Therefore, the air below the paper exerts more force than the air above and hence does not fall.

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Some More Questions From Mechanical Properties of Fluids Chapter

Can fluids withstand tangential stress?

Can fluids withstand normal stress?

Why the fluids do not have any modulus of rigidity?

Which phase of fluid is more compressible?

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?