Is there zero gravity in water like in space?

Question

This is part of my science fair project also.

Answer 1

No, why would you think that?

Answer 2

There is "zero gravity" in neither.

In space, people inside a ballistic spacecraft do not feel the normal effects of gravity (e.g., weight) because they are falling at the same speed as the spacecraft.

F = G*M*m/d^2

If you take the space shuttle and move it up to an altitude of 200 km, the force of gravity on the shuttle is still 94% of what it was on Earth's surface. The reason the shuttle does not fall back to Earth is that it is moving sideways at a little under 8 km/s (a little over 17,000 mph). By the time it "falls" to Earth, Earth is no longer there. People inside are also attracted by the same force of gravity and traveling sideways at 8 km/s. They are in "free fall".

If the engine were to fire, this would cause the shuttle to accelerate. The people inside would be pushed forward by the back wall of the cabin: they would feel some weight (even though gravity itself has not changed).

In water, there is gravity. What keeps certain things from sinking is buoyancy. By being immerse in water, an object must displace a volume of water: the object pushes the water out of the way, the water pushes back.

If you arrange things so that the volume of water displaced weighs exactly the same as the object, then the buoyancy pushes up with exactly the same force as gravity pulling down.

This is what they do with the astronauts in their suits, when they train underwater.

However, the astronaut inside the suit is in air. The is no water pushing against his (or her) body so he feels weight. He will feel that he is standing inside the suit (he will have weight pressing down on the inside of the shoes, for example).

In space, the astronaut and the suit are both in free fall so there is none of this pushing. Therefore, there is a (tiny) difference between how the astronaut feels in space and how he feels in water.

Answer 3

Actually there isn't even zero gravity in space. But first I'll tell you about water.

Things weigh less in water because of, buoyancy,, described by the Archimedes Principal.

You can learn about that here:
http://www.seed.slb.com/en/scictr/watch/bathroom/duck.htm


About gravity in space:

Gravity is caused by mass. All things with mass have a gravitational field. The strength of this fields drops off rapidly the farther away you move from the the center of mass (center of gravity) of the object. Because of this, you would weigh a little less on Mt. Everest as you do at the beach...because you are farther from the center of mass of the Earth.

The boundary between outer space and "not outer space" is arbitrary, kind of like the borders of a country. It's where we decide to say it is.

If there were a mountain that rose up to the height that the space station orbits at, and you stood on a scale on top of it, you would weight something. If you jumped off the mountain you'd fall back to Earth.

Things in orbit are actually in a perpetual state of falling. They don't hit the ground though because they are moving horizontally at a very fast speed and because the Earth is generally spherical in shape, if they move at just the right speed at just the right altitide, they move "over the horizon" as fast as they fall and so never actually get closer to the ground.

The Earth orbits the sun the same way.

Now you can't have zero gravity in space when something with mass exists in it, but you can have something called zero net gravity.

This is a null point between two massive bodies, like the Earth and the moon, where the gravitational pull of one of them is the same as the gravitational pull of the other one. If you were at that point, both things would tug on you equally and you wouldn't fall towards either. It would be hard to find this point because it's always moving, since the Earth and moon and other things in the solar system and universe are always moving, points like this do exist.

Answer 4

No. Though floating in water can simulate zero gravity (this is how astronauts train on Earth in large swimming pools). In reality, even though you are floating perfectly balanced (neither rising nor falling in the water), you are still experiencing gravity inside your body. For example, everything in a submarine is still firmly stuck to the deck by it's weight exactly as if it was on dry land. With zero gravity (or properly when you are in orbit micro-gravity) you are truly weightless in every part. Your inner ear will no longer be able to sense up and down (which you can still do under water).

Answer 5

No, their is gravity in water. Drop something like a rock in water and watch it sink.

Their is however an issue with buoyancy. Somethings float in water because they displace less space then an equal amount of water.

Answer 6

No. In water you are dealing with boyancy. A ship floats on water if it displaces more water than its own weight. But there is still gravity and a ship on the water still weighs a lot. Poke a hole in the bottom and then see how fast it sinks!!!

Answer 7

no, inside the water there is no such thing as zero gravity. The h2o is just like that...sry for my poor explanation i cant find a way to put it on paper

Answer 8

No. there is not zero gravity in space. gravity keeps the moon in its orbit , same for the planets.

Answer 9

it could appear that way only if something has the same density as water but there is gravity

Answer 10

No.

if there was zero gravity in water, the water wouldn't be there.

Answer 11

No

A rock sinks