relative density and gravity
The property that causes a boat clay to float is its shape and design, which displaces enough water to create buoyancy. In contrast, a clay ball sinks because it doesn't displace enough water to offset its weight.
A crumpled ball of aluminum will sink in water because it is denser than water. Even though aluminum can float in its solid form due to its low density, once crumpled into a small, dense ball, its overall density increases, causing it to sink.
A small ball of plasticine is denser than water, so it displaces less water than its own weight. This results in a net downward force on the ball, causing it to sink.
A tennis ball will float in water because it is less dense than water. The air inside the ball helps to keep it buoyant on the surface of the water.
The force causing the ball to sink is gravity. Gravity pulls objects towards the center of the Earth, which causes the ball to accelerate downward until it reaches the bottom of the water.
The property that causes a boat clay to float is its shape and design, which displaces enough water to create buoyancy. In contrast, a clay ball sinks because it doesn't displace enough water to offset its weight.
If you make the modeling clay into a bowl shape, it should float
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.
No, the clay will still be denser than the water. You are spreading it out over a larger area, and the clay will not be heavy enough to break the surface tension of the larger area of water. So, the answer is surface tension keeps it from sinking.
Clay, in fact, does sink at certain conditions. ~Liz http://eragongal44.webs.com
The clay boat (like a steel ship) displaces its own weight in the water. So, as long as the sides of the clay boat (or steel ship) is above the water level, it will float. A solid piece of clay will (like a stone) sink immediately.
A crumpled ball of aluminum will sink in water because it is denser than water. Even though aluminum can float in its solid form due to its low density, once crumpled into a small, dense ball, its overall density increases, causing it to sink.
Gravity.
Depends on the medium, and whether the ball is solid or not. A solid ball would float on mercury, sink in water. If it were hollow enough (or filled with, say, cork) it would float in water.
Something will sink if it is heaver than the same volume of water, so it depends on the density of the ball. Rock is denser than water so stones sink. However, depending on what a ball is made of it may or may not be heavier than the same volume of water. For example a golf ball is denser than water so it sinks, but a ping-pong ball is lighter and will float.
The sand puts weight on it and it makes in sink.
A small ball of plasticine is denser than water, so it displaces less water than its own weight. This results in a net downward force on the ball, causing it to sink.