General Science • PhysicsEasy
Which of the following statements correctly explains why a bucket filled with water feels lighter when submerged entirely underwater compared to when it is lifted in air?
A. The upward buoyant force exerted by the surrounding water opposes the downward gravitational force.✓ Correct Answer
B. The viscosity of water reduces the effective mass of objects moving within its fluid medium.
C. The hydrostatic pressure acting on the bottom of the bucket compresses the metal creating internal lift.
D. The surface tension forces along the rim of the bucket neutralize the weight of the water column inside.
💡 Solution & Explanation
Archimedes principle states that any object wholly or partially immersed in a fluid is buoyed up by a force equal to the weight of the fluid displaced by the object. When a bucket is submerged, the displaced water generates an upward thrust that subtracts from the net apparent weight experienced by the person lifting it. Other choices incorrectly attribute the weight reduction to fluid viscosity or surface tension effects which do not generate macroscopic lifting forces of this magnitude. Buoyancy depends strictly on fluid density, gravity, and the submerged volume.
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