Buoyancy || for Class 9 in Hindi

In this Science (Physics) video in Hindi for Class 9 we explained buoyancy or upthrust or buoyant force. This is a topic from Chapter 10 - 'Gravitation' for class 9th from NCERT.
Buoyancy or upthrust, is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object.
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🔴 Click here to watch the whole playlist on Chapter 10 : 'Gravitation' for Class 9 :
• Introduction to Gravit...
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Previous videos :-
🔴 Introduction to Gravitation
• Introduction to Gravit...
🔴 Universal Law of Gravitation
• Universal Law of Gravi...
🔴 Free Fall || Calculating 'g'
• Free Fall || Calculate...
🔴 Motion Under Gravity
• Motion Under Gravity |...
🔴 Motion Under Gravity (Part 2)
• Motion Under Gravity (...
🔴 Mass and Weight
• Mass and Weight || for...
🔴 Weight of an object on the moon
• Weight on Moon || for ...
🔴 Kepler's Laws of Planetary Motion
• Kepler's Laws of Plane...
🔴 How did Newton guess the Inverse Square Rule
• How did Newton guess t...
🔴 Thrust and Pressure
• Thrust and Pressure ||...
🔴 Pressure in Fluids
• Pressure in Fluids || ...
🔴 Pressure in Fluids (Part 2) - Pascal's law, Torricelli's law
• Pressure in Fluids (Pa...
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Achi pani k andr ku hoti hain sari bahir mtlb uper float ku nahi krti

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[@RohitKumar-ji9dm]

Sir , pls explain this statement: once the object is Fully immersed under the liquid, then further lowering it in the liquid does not make it any more lighter.

[@advikapanwar12]

Its because the force applied by water does not depend on how much we puch it into the water.
Means if weight of object is lighter than buoyant force than pushing down futher does not make it lighter.

[@bhagwatiyadav3637]

This is because we know that the buoyant force applied on an object depends on the volume of the immersed object. The maximum water displaced by an object is equal to its own volume. When an object is fully immersed in the water then the maximum water is displaced and lowering the object anymore in water does not displaced more water and thus buoyant force also not increases and thus object an object does not feel lighter anymore.

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Pani ka weight uss object volume ke brabar joga ya uss object ke weight ke brabar hoga ?

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Sir why is buoyant force upward acting

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When an object is immersed in liquid it exerts a upward force on the object and force is called upthrust force or buoyant force

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Vpg = Upthrust

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Sir hm ye kyu nhi bol skte ki jitna us object ka weight h utna he uspe fb(force) lgega kyuki jitna uska weight h utna he na vo water ko displace kiya hoga

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