Why does cork float to the top of water when left at the bottom?

Question

tell me before 4th march

Answer 1

it is less dense than water

Answer 2

For a rectangular solid, the formula Mass / (Length x Width x Height) can be used. For an irregularly shaped solid, the displacement can be used in place of L x W x H. A common device for measuring fluid density is a pycnometer. A device for measuring absolute density of a solid is a gas pycnometer. The density of a solid material can be different, depending on exactly how it is defined. Take sand for example. If you gently fill a container with sand, and divide the mass of sand by the container volume you get a value termed loose bulk density. If you took this same container and tapped on it repeatedly, allowing the sand to settle and pack together, and then calculate the results, you get a value termed tapped or packed bulk density. Tapped bulk density is always greater than or equal to loose bulk density. In both types of bulk density, some of the volume is taken up by the spaces between the grains of sand.

so therefore cork floats in water

Answer 3

Not only is water more dense than the cork, but also the cork has lots of air pockets in it.

Answer 4

Yes, because its density is lower than water's... but I think a fuller explanation is in order.

Imagine a cork-sized 'lump' of water floating in the water.  It feels a downwards force, (its weight), and an upwards force from being pushed by the rest of the water (the upthrust).  Since this 'lump' of water does not move it follows that the weight is exactly equal to the upthrust.

Now when the lump of water is replaced by a cork, the weight is, of course, less (because the density is less).  However, the upthrust is the same (because the rest of the water just 'sees' a cork-shape and whether it is made out of cork, water or lead makes no difference).

So it now follows that the force upwards, the upthrust, is more than the force downwards, the weight.  And so there is a net force (and hence acceleration) upwards.

Does this make sense?

Answer 5

the density of water it more than the cork. the cork will displace some of the water but will always float to the top because its density is less than waters.

Answer 6

water has a higher density

Answer 7

Because it has a density much less than that of water.

Answer 8

Alright here it is...

Water has a higher density...

Density is how compress (or compact) something is...

Density in simple terms is weight...

So the water is heavier...

And the cork has a lower density (meaning it's lighter)...

Another example:

Wood floats on top of water because it has a lower density than water...

Rocks sink in water because they have a higher density that water...

So higher density pretty much means heavy...

And lower density pretty much means light...