A stone sinks because it is denser than water, so the upward buoyant force is not enough to support its weight. A boat floats because its shape and materials displace enough water to create an upward buoyant force that is greater than its weight, allowing it to stay afloat on the water.
Pumice is a type of stone that floats on water due to its high porosity and low density.
A pencil floats, a human no float, a feather floats, paper floats, ice floats, keys do not float, rocks do not float, coins do not, flip flops float. Second answer: I think you meant to ask, 'What floats and then some time later starts to sink. If that is what you meant, the answer is: There are absorbent substances which float when dry, then after absorbing water while they are floating, they increase in density and then sink.
A bar of steel sinks in water because its density is higher than that of water, causing it to displace less water than its own weight. A boat floats because its shape and design displace enough water to create an upward force called buoyancy that is greater than its weight.
pumice stone
Density is the property that causes a ball to sink and a boat to float. If an object is denser than the liquid it is placed in, it will sink, while if the object is less dense than the liquid, it will float.
Pumice is a type of stone that floats on water due to its high porosity and low density.
It floats, but after a while silk will sink.
A pencil floats, a human no float, a feather floats, paper floats, ice floats, keys do not float, rocks do not float, coins do not, flip flops float. Second answer: I think you meant to ask, 'What floats and then some time later starts to sink. If that is what you meant, the answer is: There are absorbent substances which float when dry, then after absorbing water while they are floating, they increase in density and then sink.
because inside the boat has air. think when u blow up a ballon it floats same with a boat the out side of the boat is metal
because wood floats and too much rubber will make the darn'ed boat sink
Floats
All plastic items float on water, so therefore a plastic boat floats on water.
A bar of steel sinks in water because its density is higher than that of water, causing it to displace less water than its own weight. A boat floats because its shape and design displace enough water to create an upward force called buoyancy that is greater than its weight.
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 pen floats
As per Archimedes principle for floating the weight of the displaced water has to be equal to the weight of the boat. Hence for more water to get displaced the boat has to sink more.
Old boat got sink