What is the upward force on an object in a fluid equal to the weight of the fluid displaced by that object called?

What is the upward force on an object in a fluid equal to the weight of the fluid displaced by that object called?

• A. Lift
• B. Buoyant force
• C. Drag
• D. Weight

Answer: (B)

The upward force on an object in a fluid that is equal to the weight of the fluid displaced by that object is called the buoyant force. This principle is based on Archimedes' principle, which states that any object submerged in a fluid experiences an upward force equal to the weight of the fluid it displaces. This force is what allows objects to float or rise within a fluid, depending on their density relative to the fluid.

The buoyant force plays a crucial role in various applications, including ship design, the behavior of balloons, and understanding why certain objects sink or float. It is distinct from lift, which is a force primarily associated with the movement of air over a wing, drag, which is the resistance force experienced by an object moving through a fluid, and weight, which is the gravitational force acting on the object itself. Understanding buoyancy is essential in the study of fluid mechanics and various real-world scenarios involving fluids.