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Mechanical Properties of Fluids
Question
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The force required by a man to move his limbs immersed in water is smaller than the force for the same movement in air. Why? 

Answer

Upward thrust acting on the limbs is more in water than in air.
Therefore, the force required to move the limbs in water is smaller than that in air.

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Some More Questions From Mechanical Properties of Fluids Chapter

What is hydrodynamics?

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?