The force of buoyancy on an object floating on water is F, while it is S on an object that sinks in water. The weight of both the objects is W. Which one of the following is always true?
[amp_mcq option1=”F = W and S = 0″ option2=”Both F and S have upward direction” option3=”F has upward direction and S has downward direction” option4=”F = W and S > W” correct=”option2″]
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UPSC Geoscientist – 2023
For an object that sinks in water, the buoyant force (S) is less than the weight of the object (W). The net force (W – S) is downward, causing the object to accelerate downwards (sink). S is equal to the weight of the fluid displaced by the fully submerged object. Even though the object sinks, the water still exerts an upward buoyant force on it. Therefore, both F (for floating) and S (for sinking) are upward forces.