How do ships stay afloat??

Answer 1

It is just magic !
The "displacement" theory is just a con.
When the bottle of champagne is smashed against the side of the boat, all the little "magic" bubbles then help keep the boat afloat.

Answer 2

an easy test ...
get something that floats that will fit in your bucket or tub
Fill the tub to the top
slowly put the thing that floats in the water

All the water that spills over the side basically weighs the same as the floating thing

take the floating thing out, and you'll see the water has gone down in the tub. That amount of water was "displaced".

EXPLAINATION:
the ship builder knows the ship is heavier than the water, so makes it long and wide enough so the amount of water "displaced" (see above) eg. 5 tons, is the weight of the ship. Now the builder knows some of the ship will be below water level. He just has to make the sides high enough while allowing for "displacement" to make sure the ship will not take on water.

Have a look in the harbour and the ships that carry the heavy stuff ars long and wide. Those ship builders are pretty smart

Answer 3

Sir:

Ships stay afloat by displacing water, i.e., moving it out of the way. Water has weight. A ship has weight. A ship displaces its own loaded weight of water when it is in the water. Think about it... You never see the bottom of a ship when it is in the water, only the upper part.

A ship begins to sink when it cannot displace more water than the weight of the ship. For example, if a leak in the hull occurred, and water began to come into the ship, the ship's total weight would increase. The speed of water coming into the ship would determine how fast the ship starts going down until there is nothing left above the water.

Answer 4

Water is made up of molecules in motion. This creates a resistance to objects entering it. If there is any buoyancy to the object, this combines with the resistance to keep it afloat. Now for something as large as a ship, it requires a large amount of water. The same vessel would not float in shallow water.

Answer 5

Simple answer:

Compare a balloon filled with air and the same balloon filled with water. You know that a balloon with air can be the same size as the balloon with water, but the one with air floats on water. The ships are not filled with machines and metal only, they have air inside of them, and things that are lighter than water, such that they are like big balloons that are not totally filled with water.
If you put the 2 balloons on a see-saw, the one with water will go down not the one with air, even though they have the same size. Now imagine the ship that is totally water and no space in it, compared to a ship that is like a metal balloon full of air, the ship that is totally water will go down but the metal balloon of air goes up if they are on the see-saw.

Now if you want the see-saw to be balanced, that is, horizontal, you need to start taking away some water from the water balloon. Before you take away all the water, the see-saw is balanced already. The water remaining on the see-saw is the same weight as the metal balloon, but you realise that it is a smaller size. So now you know that as long as the metal balloon can take up that same, smaller sized space in the water, it can be balanced by that same, smaller sized amount of water.

Scientific answer:

By displacing the volume of water that has the equal weight as their own weight. In other words, if the ship has a weight of 1 ton, and it is able to displace 1 ton of water without its entire volume being submerged, it floats.

In other words, ship has enough volume to displace a volume of water that has the same weight as the ship. There will be remaining volume for the ship, such that if you try to push the ship down, the ship will displace more water of the same weight until the weight balances the magnitude of the force you are applying, and the ship will not sink further.

NOTE: It does NOT displace water of MORE weight than it's own.

By two principles: Archimede's Principle states that the upthrust on a submerged body is equal to the weight of the displace fluid.

Note that it is equal not more or less than.

Principle of flotation states that when an object floats, the upthrust acting on it must be equal to its own weight.

What is upthrust? When you submerge an object in a fluid, the object will experience a difference in pressure between its lower and upper surfaces, this difference in pressure results in an upward force called upthrust.

Think about placing a ball that floats in water. Let us imagine that half the ball goes underwater and half remains on top. The half that has gone underwater, has to be able to "push" away that same amount of water that the half of the ball takes up in space. If you imagine the ball to be in a cup, you would know that the water level would rise, because the ball has "pushed" away some water and this "push" is holding up that amount of water above the original level. The weight of this amount of water would be equals to the weight of the "push". So in other words, the weight of the ball is equal to the weight of the amount of water "pushed" away.

Imagine a U shaped tube with water in it, and a "plunger" in one end of the tube. The water level in both ends are the same at the start, but when you put a object of weight "N" on the plunger and the plunger moves down, it will continue to move down until the water level on the other end of the U tube rises up by the same distance it moved down in it's own "tunnel". So you can see that the water moved up in the other tube has the same weight as the object in the tube with the plunger. Like a balance.

Answer 6

they don't! It's an optical illusion! What happens is that there is a bloke with a top hat and a cape in the boat who makes it appear to float, when really it's still in Bristol or Portsmouth or somewhere! Every time you think you've been on a boat you were hipnotised! you have never been abroad.

The same is true for areoplanes!

Answer 7

a deliver floats for an analogous reason you do. the load of the water it displaces is greater than the load of the deliver. As a deliver turns into greater heavily loaded, it settles deeper into the water displacing that quite greater water. If the water could get into the air area created via the boat's hull, via, say a hollow, it may now no longer displace the water and could sink.

Answer 8

The buoyancy of the air inside the vessel creates more uplift than the weight of the vessel itself does downwards.

Air is less dense than water.

Answer 9

Lots of tiny fish swim along under the boat holding it up in the water.

Answer 10

Because they displace more water than they weigh. ie; if a ship weighing 10,000 tonnes displaces the equivalent of 20,000 tonnes of water, then it will float.