The upward force acting on an object immersed in a fluid is called upthrust. The buoyant force is the upward force exerted on an object when an object is wholly or partially immersed in a liquid. Upthrust is another name for buoyant force. From Archimedes' principle, the magnitude of the buoyant force acting on an object immersed in a liquid is equal to the weight of the object displaced by the immersed object.

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What is upthrust?

Important Questions on Buoyant Force

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A metal sphere is dipped in water. If at

0 ° C

4 ° C

the buoyancies in water are

β_{1}

and

β_{2}

respectively, then :

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A jar is filled with two non-mixing liquids $1$ and $2$ having densities $d_{1}$ and $d_{2}$ , respectively. A solid ball, made of a material of density $d_{3}$ , is dropped in the jar. It comes to equilibrium in the position shown in the figure. Which of the following is true for $d_{1}$ , $d_{2}$ and $d_{3}$ ?

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The weight of the wooden block is

W

. The apparent weight of the body on floating water is

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Two metal pieces when immersed in liquid experience equal upthrust on them, then :

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A block floats with its fraction

η_{E}

inside water when immersed in a beaker containing water and kept on the earth. The beaker along with the block is shifted to the surface of the moon. If

η_{M}

is the fraction of the block now immersed in water, which of the following relations is correct?

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Which of the following happens due to buoyant force?

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The same body is immersed in two liquids A and B in succession. The extent to which the body sinks in liquid B is less than in liquid A. What are the conclusions that could be derived from such an observation?

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Naveen and Paul are friends. Paul wanted to celebrate his birthday at home. He bought balloons filled with hydrogen gas from a balloon man. Naveen helped in decorating Paul's room with balloons and cards. Why balloons filled with hydrogen rise up in the air?

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Why is a bucket of water lighter when in water than when it is taken out of water?

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A body floats in a liquid:

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Upthrust depends upon:

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If the density of the object placed in a liquid is equal to the density of the liquid, the object will: