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Mechanical Properties of Fluids

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Physics Part II

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Work has to be done to increase the area of free surface of liquid. Explain it in accordance with the law of conservation of energy.

No net force is experienced by the molecules in the bulk of liquid and are free to move within. But, a net inward pull is experienced by the molecules in the surface film. When the area of the free surface is increased, the molecules from bulk move to surface film against the inward pull and hence work has to be done to increase the area of free surface. 
This work is stored in the form of potential energy. Therefore, work done to increase the area of the surface of liquid is in accordance with the law of conservation of energy. 

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. 

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

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

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.

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 fluid?

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


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