2006-06-24 22:05:32 · 6 answers · asked by annie 2 in Science & Mathematics ➔ Physics
...because their density is less than water density (1000 Kg/m^3).
If the density of an object is less than the density of the water, it floats on the surface of the water. If the density of the object is equal to the density of the water, the object floats anywhere inside the water. If the density of the object is more than the density of the water, the object sinks to the bottom.
2006-06-24 22:12:32 · answer #1 · answered by zsozso 4 · 1⤊ 1⤋
When an object is placed on a wooden table, it is at rest on the table.
Actually the object bends the wood a little, the depression is so small that we are not able to detect it. This can be understood by imagining that what would happen if a huge rock is placed on the wooden top.
The object is at rest because the downward weight is balanced by the elastic force of the wooden top which tends to regain its original shape. If this elastic force is not sufficient to balance the weight the object goes down.
The same thing happens in the case of objects floating in the liquid.
The cork or wood when placed on the surface of water, it displaces some amount of liquid. The displaced liquid tries to fill the space from which it is displaced. This in turn gives a upthrust on the object.
If the force equals the weight of cork then it floats, Other wise like in the case of stone, it sinks.
It can be shown that if the density of the object is less than that of water, then the object will float; if it is greater than that of water then it will sink.
Imagine a sphere of wate inside the water; it is rest on any place inside the water because its density is the same as water.
2006-06-24 22:58:42 · answer #2 · answered by Pearlsawme 7 · 0⤊ 0⤋
Becouse their densities r less than that of water, the density of iron is more than that of water
But i know that u will ask: if the density of iron is more than that of water, How the ships made of iron (Big crusers & big ships) don't sink ???
easy answer: Becouse they r designed to be hollow from inside (even if there are people in it), so this hollow rigion inside the ship makes its average density is less than that of water so it floats
2006-06-25 13:22:50 · answer #3 · answered by Kevin 5 · 0⤊ 0⤋
because their densities are lower than that of water
2006-06-25 01:52:57 · answer #4 · answered by sid_2709 2 · 0⤊ 0⤋
because they weigh less than the same volume of water
2006-06-24 22:09:46 · answer #5 · answered by Norman 7 · 0⤊ 0⤋
coz their densities r less than that of water.
2006-06-24 22:11:37 · answer #6 · answered by thechosenone 2 · 0⤊ 0⤋