why does an object float or sink in water
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Answer: When the object has density less than 1 g cm-1 then it floats on the surface of water, because, it always displaces more weight of water than its own weight. ... As buoyant force is less than its own weight, therefore, it sinks.
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Explanation:
If one considers a single column of liquid, then it can be considered as a concoction of the many overlying layers, one over the other with fluctuating pressure. The pressure at the bottom of the liquid would be greater than at the top; this is for the reason that as we go down in the liquid the number of layers of the liquid that are overlying i.e. the layers one over the other, increases.
Owing to the difference in the pressure amid the layers, there tends to be a made-up force being applied to it in the upward direction. This force leads to the acceleration of the object that has been submerged, in the upward direction. The force is always in the vertical direction.
It can also be said that the magnitude of the upward force is basically equivalent to the difference in the pressure of the topmost and the last layer and also equivalent to the weight of the fluid that has been displaced.
Floating is the consequence of the above concept. The object should be less dense than water, or else, if its density is greater, it will have a tendency to sink.
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