Buoyancy force is described by which principle?

Buoyancy force is described by which principle?

• A. Newton's law of gravitation
• B. Bernoulli's principle
• C. Pascal's law
• D. Archimedes' principle

Answer: (D)

Buoyant force comes from how pressure in a fluid varies with depth, and it is described by Archimedes' principle: the upward buoyant force on a submerged or partially submerged object equals the weight of the fluid displaced by the object. In a fluid, pressure increases with depth, and when you look at all the pressures acting on the surface of the object, the vertical components add up to an upward force equal to ρ_fluid g times the submerged volume. This explains why an object less dense than the fluid rises and floats, while a denser object sinks—the buoyant force depends on the displaced fluid’s weight, not on the object’s weight alone. The other options don’t describe buoyancy directly. Newton's law of gravitation outlines the attraction between masses, not the fluid-mediated force on a submerged body. Bernoulli's principle deals with pressure changes in moving fluids and energy along streamlines, not the static buoyant force from displaced fluid. Pascal's law states that pressure applied to a confined fluid is transmitted equally in all directions, which is related to pressure distribution but does not by itself define buoyancy.

Buoyant force comes from how pressure in a fluid varies with depth, and it is described by Archimedes' principle: the upward buoyant force on a submerged or partially submerged object equals the weight of the fluid displaced by the object. In a fluid, pressure increases with depth, and when you look at all the pressures acting on the surface of the object, the vertical components add up to an upward force equal to ρ_fluid g times the submerged volume. This explains why an object less dense than the fluid rises and floats, while a denser object sinks—the buoyant force depends on the displaced fluid’s weight, not on the object’s weight alone.

The other options don’t describe buoyancy directly. Newton's law of gravitation outlines the attraction between masses, not the fluid-mediated force on a submerged body. Bernoulli's principle deals with pressure changes in moving fluids and energy along streamlines, not the static buoyant force from displaced fluid. Pascal's law states that pressure applied to a confined fluid is transmitted equally in all directions, which is related to pressure distribution but does not by itself define buoyancy.