Physics
Answer
It is easier to lift a heavy stone under water than in air because due to the effect of upthrust, the stone experiences an upward buoyant force that balances the true weight of the stone which is acting in the opposite direction.
Hence, the weight of the stone immersed in water appears less than the actual weight.
Related Questions
A sphere of iron and another of wood, both of same radius are placed on the surface of water. State which of the two will sink? Give reason to your answer.
How does the density of material of a body determine whether it will float or sink in water?
What do you understand by the term upthrust of a fluid? Describe an experiment to show it's existence.
Describe an experiment to show that a body immersed in a liquid appears lighter than it really is.