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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
What is the fractional volume submerged of an ice cube in the pail of water placed in an enclosure which is falling freely under gravity?

A system is in a state of weightlessness, when the system is falling freely. So, weight of the ice cube as well as  upward thrust would be zero if the object is falling freely. So, ice cube floats with any volume submerged.


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 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.