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Mechanical Properties of Fluids

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Physics Part II

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
A man is sitting in a boat floating in the pond. If the man drinks some water from the pond, then what will happen to the level of water in the pond?

When the man sitting on a boat drinks water, the level of the water tend to decrease as a result of decrease in the volume of water in the pond. As the man gulp down the water, his weight will also increase by mass m. Due to increase in the weight of the man, the boat will sink a little and displace the the same volume of water drank by the man. Hence, the level of water in the pond raised is equal to the level fallen when the man drank the water. 

Thus, the level of water will remain unchanged. 
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What is hydrodynamics?

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

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


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

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