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Mechanical Properties of Fluids

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Physics Part II

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Class 10 Class 12
A cork of density 0.18gm/cc floats in liquid of density 1.44 gm/cc with 20cc of volume inside the liquid. Find the mass and volume of the cork.


Density of the cork, σ = 0.18 gm/cc

Density of liquid,ρ = 1.44 gm / cc

Volume of liquid, V = 20 cc

Now, according to the law of floatation,

Weight of cork = Weight of liquid displaced by cork.

Therefore mass of the cork is given by,

              mg = Vρg                m =             m=20×1.44                     =28.8gm 

Volume of the cork, Vc=mσ=28.80.18=160cc

Why solids have definite shape while liquids do not have definite shape?

Solids: Intermolecular forces are very strong and thermal agitations are not sufficiently strong to separate the molecules from their mean position. Solids are rigid and hence they have definite shapes.
Liquids: In liquids intermolecular forces are not sufficiently strong to hold the molecules at definite sites, as a result they move freely within the bulk of liquid, therefore, do not possess definite shapes. Liquids take the same shape as that of the container. 

What is fluid?

Any material that can flow is a fluid. Liquids and gases are examples of fluid.


What is hydrodynamics?

Hydrodynamics is the branch of science that studies about the force exerted by the fluids or acting on the fluids. 

What is hydrostatics?

Hydrostatics is the branch of fluid mechanics that studies incompressible fluids at rest. The study of fluids at rest or objects placed at rest in fluids is hydrostatics.

Do intermolecular or inter-atomic forces follow inverse square law?

No. Intermolecular and inter-atomic forces do not obey the inverse square law.