What is the difference between static and dynamic buoyancy?

The correct choice highlights that static buoyancy refers to the buoyancy of an object at rest in a fluid, meaning its weight and the buoyant force acting on it are in balance without any motion influencing these forces. In this state, the object achieves a stable condition where it either floats, sinks, or remains suspended in the fluid.

On the other hand, dynamic buoyancy comes into play when an object is in motion within the fluid, such as when a diver is swimming or moving quickly underwater. In these situations, additional factors, such as the speed of the object and the resulting hydrodynamic forces from the fluid flow, influence the overall buoyancy experienced by the object. The dynamic aspect means that the buoyant force is affected by the velocity and posture of the diver or object moving through the water, leading to variations in buoyancy during motion compared to when the object is stationary.

Understanding this distinction is crucial for divers and anyone working with buoyant forces in fluids because it influences how one operates underwater, responds to changes in position or speed, and manages buoyancy control.