Buoyancy or Up thrust


 
 
Concept Explanation
 

Buoyancy or Up thrust

BUOYANCY or UP THRUST:  The tendency of a liquid to exert an upward force on an object immersed in it is called buoyancy. Liquid pressure is measured with manometer. A liquid exerts pressure in all directions i.e. downward, upward and sideways. The pressure is the same in all directions at the same depth. Pressure increases with depth. From all the above examples, we conclude that the objects appear to be less heavy when submerged in water than they are in air. It is due to the fact that the water exerts an upward force on them.

In fact, every liquid exerts an upwards force on the objects immersed in it. The tendency of a liquid to exert an upward force or an object placed in it, is called buoyancy. And thus, the upward force acting on an object immersed in a liquid is called buoyant force. In other words, the buoyant force is also known as up thrust.

Sample Questions
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Question : 1

When an object is made to float in two different liquids of density d_1 and d_2, the lenght of the object seen above the liquid surface are l_1 and l_2 respectevely. Which of the following is the correct alternative ?

Right Option : C
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Question : 2

A floating boat displaces water weighing 600 N. What is the weight of the boat?

Right Option : A
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Question : 3

An egg when placed in ordinary water sinks but floats when placed in brine. This is because

Right Option : C
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Explanation
 
 


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