Which principle states that an object submerged in fluid experiences an upward force equal to the weight of the fluid it displaces?

The principle that states an object submerged in a fluid experiences an upward force equal to the weight of the fluid it displaces is known as Archimedes' Principle. This principle is fundamental in understanding buoyancy. It outlines that when an object is placed in a fluid, the fluid exerts an upward buoyant force that counteracts the weight of the object, enabling us to determine whether the object will float or sink.

Archimedes' Principle is critical in various fields, including hydraulics and engineering, where it helps in designing vessels, determining the behavior of submerged structures, and assessing the buoyancy of materials. Its application in everyday life can be seen in activities such as swimming, where its effects allow swimmers to float and move easily in water.

The other principles mentioned, like Pascal's Law, which pertains to fluid pressure transmission in confined systems, and Bernoulli's Principle, which relates to the behavior of fluid flow and pressure differences, do not address the force experienced by objects submerged in fluids. Newton's Law of Motion relates to the relationship between force and motion but doesn’t specifically address buoyancy. Understanding Archimedes’ Principle is essential for grasping the basic concepts of fluid mechanics and buoyancy effects in various engineering applications.