Which principle states that the internal pressure of a fluid decreases at a point where the speed of the fluid increases?

The principle that states that the internal pressure of a fluid decreases at a point where the speed of the fluid increases is Bernoulli's Principle. This principle is fundamental in fluid dynamics and explains the relationship between the speed of a fluid and its pressure. According to Bernoulli's Principle, as the velocity of a fluid increases, its pressure must decrease in order to conserve energy within the system. This phenomenon is evident in various real-world applications, such as in aircraft wings where faster airflow over the wing creates lower pressure above it compared to the higher pressure below, generating lift.

The other options do not pertain to fluid dynamics in the same context. Newton's law of motion relates to the relationship between the motion of an object and the forces acting on it, lacking any specific reference to fluid behavior. Hindenburg's Theory is not a recognized principle in physics or fluid mechanics and does not apply to the context at hand. Archimedes' Principle deals primarily with buoyancy and the upward force experienced by objects submerged in a fluid, which focuses on different interactions than those described by Bernoulli's Principle.