Question

What is the main reason for the upthrust of a body in a liquid?

Answer 1

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⭐⭐⭐⭐⭐ ANSWER ⭐⭐⭐⭐⭐
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*⃣*⃣*⃣ DISCUSSION - A *⃣*⃣*⃣

⏩ The upward force exerted on a body by the fluid in which it is submerged, is called the upthrust or buoyant force.

⏩ The property of liquids to exert an upward force on a body immersed in it, is called buoyancy.

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*⃣*⃣ REASON FOR UPTHRUST *⃣*⃣

We know that a liquid contained in a vessel exerts pressure at all points and in all directions. It increases with depth inside the liquid. When a body (say, a block) of area of cross section A, is immersed in a liquid, the pressure P2 exerted upwards on the lower face of blcok (which is at a greater depth) is more than the pressure P1 exerted downwards on the upper face of the block (which is at a lesser depth). Thus there is a difference in pressure (P2-P1) between the lower and upper faces of the block. Since force = pressure × area, the difference in pressures due to liquid on the two faces of the block causes a net upward force (i.e., UPTHRUST) on the body. However, the thrust (F) on the side walls of the body gets neutralised as they are equal in magnitude and opposite in directions.


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ABOVE ATTACHED PICTURE IS ILLUSTRATED FOR BETTER UNDERSTANDING.

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⭐⭐⭐ ALWAYS BE BRAINLY ⭐⭐⭐

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Answer 2

Answer:

due to the difference of forces leaving a net upward force

Explanation:

this genius has given a correct answer but a little complicated one so I will try to make it easier for all

now the question is what is the main reason for the effect of a body in a liquid

answer to this question is the Abstract of a body in a liquid is because of the pressure which is exerted by the liquid being at greater that is also greater say P2 > P1 which is exerted by the object due to its own weight. since P2 is greater than P1 it leaves a net upward force left on the object i.e P2-P1 now the question is that a liquid always exerts pressure in all its part so when the pressure is exerted on the horizontal planes i.e the two sides of the solid it gets neutralized because of the same height same density and same acceleration due to gravity but in case of vertical pressures ime P1 and P2 the height difference therefore leaving an upward net force on it therefore when an object is immersed in water it it experiences upthrust ...........

I hope you got your answer mark my answer as brainliest...

answer from akkicoolyo