1. Gravity: This force pulls the object downwards, towards the center of the Earth.
2. Buoyancy: This is an upward force exerted by the fluid (water, air, etc.) on the object. It is equal to the weight of the fluid displaced by the object.
Here's how they balance:
* When an object is placed in a fluid, it displaces some of the fluid. This displacement creates a volume of fluid with a certain weight.
* The buoyant force is equal to the weight of the displaced fluid. This means the buoyant force pushes upwards with a force equal to the weight of the displaced fluid.
* If the buoyant force is greater than or equal to the object's weight (due to gravity), the object floats. This is because the upward buoyant force counteracts the downward force of gravity, resulting in a net force of zero.
* If the buoyant force is less than the object's weight, the object sinks. This is because the downward force of gravity is stronger than the upward buoyant force.
In summary, the forces are balanced because the buoyant force pushing upwards is equal to the weight of the object pulling downwards. This results in a state of equilibrium, allowing the object to float.