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Question Question 3
Why does an object float or sink when placed on the surface of water?
An object floats or sinks in water because of the difference in densities of the substance and water. When the density of the substance is less than the density of water, then the upthrust of water is greater than the weight of the substance. Hence it floats.
When the density of substance is more than water, then the upthrust of water on the substance is less than the weight of the substance. Hence it sinks.