Why does a beach ball float on the surface of swimming pool?

A Beach ball floats on the surface of a swimming pool because it displaces an equal weight of water. The buoyant force acting on the ball is equal to the weight of the water that the ball displaces, and this force is greater than the weight of the ball itself. This causes the ball to rise to the surface and float.

The buoyant force is a result of the pressure difference between the top and bottom of the ball. The pressure at the bottom of the ball is greater than the pressure at the top, and this difference in pressure creates an upward force on the ball. This upward force is what keeps the ball afloat.

The amount of buoyant force acting on an object is determined by the density of the fluid and the volume of the object. The denser the fluid, the greater the buoyant force. This is why a beach ball will float more easily in water than it will in air. The volume of the object also affects the buoyant force, with a larger object displacing more water and experiencing greater buoyant force.

In the case of a beach ball floating on a swimming pool, the dense water of the pool provides sufficient buoyant force to keep the ball afloat. As long as the weight of the ball is less than the weight of the water it displaces, it will continue to float.