The buoyant force (F_b) acting on an object submerged in a fluid is given by the following formula:

F_b = ρVg

Where:

* F_b is the buoyant force (measured in Newtons, N)

* ρ is the density of the fluid (measured in kilograms per cubic meter, kg/m³)

* V is the volume of the displaced fluid (measured in cubic meters, m³)

* g is the acceleration due to gravity (approximately 9.8 m/s²)

Key points to remember:

* The buoyant force is equal to the weight of the fluid displaced by the object. This is known as Archimedes' Principle.

* The volume of displaced fluid is the same as the volume of the object submerged in the fluid.

* The buoyant force acts upwards, opposing the weight of the object.

Example:

Imagine a block of wood with a volume of 0.5 m³ submerged in water (density of water = 1000 kg/m³). The buoyant force acting on the block would be:

F_b = (1000 kg/m³) * (0.5 m³) * (9.8 m/s²) = 4900 N