Explain why a beach ball is more buoyant and a hammer and a rock is not?

A beach ball is more buoyant than a hammer and rock because it is made of materials that are less dense than water, allowing it to displace more water and float easier. In contrast, hammers and rocks are denser than water, causing them to sink instead of float. Buoyancy depends on the weight and volume of an object and the density of the fluid it is in.