A balloon is filled with air and a stone...

A balloon is filled with air and a stone is tied to it by thread. It is then put inside a vessel containing water, where it barely floats as shown in the adjoining figure. If it is pushed more towards the bottom by a small distance, it sinks. Explain.

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When the balloon is pushed down by a small distance, the air inside it gets slightly compressed. As a result, the buoyant force on the balloon decreases. Thus, the downward force acting on the balloon due to weight of the stone and its own weight becomes greater than the buoyant force and it sioks to the bottom.

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