- The fluid in the beaker is water, and its density is assumed to be 1 g/mL.
- The volume of the object is assumed to be 100 mL.
Buoyancy
When we wear a life jacket, our bodies float on the water instead of sinking, which can be seen as a force lifting us up.
The force of a liquid or gas to lift an object inside it is called buoyancy. The buoyant force acts opposite to gravity, pushing an object up. Therefore, if the size of the buoyant force acting on an object is greater than gravity, the object rises against gravity.
The magnitude of buoyancy
Buoyancy is created by the repulsive force of an object pushing against a fluid. The more an object is submerged in liquid, the more fluid it has been pushed. In other words, the magnitude of the buoyancy is equal to the weight of the fluid corresponding to the volume in which the object is submerged.
- Direction of Buoyancy: Opposite direction of gravity
- Magnitude of Buoyancy: The weight of the fluid corresponding to the volume in which the object is immersed.