It's pretty hard to avoid.
Lead weight, a stone, the list is endless.
It depends upon its shape. A solid brick of lead will sink. A lead weight pressed into the shape of a bowl will float, because it displaces more water, and is therefore buoyant enough to float.
It will sink
The ball will sink when the weight of the water inside the ball plus the weight of the ball is greater than the weight of the amount of water that would fit inside the ball.
An object will sink if it has a greater density than water. In this case, the weight of the water displaced by the object is less than the weight of the object.
If it is heaver than water (or what ever liquid you put it in) it will sink. Lead will sink. A cork will float.
Because of its weight and mass
It will sink.
When its weight is greater than the weight of water it displaces
a solid ceramic object would sink. however, if the object is displacing enough water proportional to it's weight, then it will float. If you put an empty glass bowl in the water, it will float; but if you allow water in, it will sink. This applies to ceramics.
Lead sinks in water because the density of lead is greater than the density of water.The displacement of water needs to be equal to the weight of the object for it to float. Lead sinks because the displacement of lead is greater than the displacement of water.
The sand puts weight on it and it makes in sink.