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I'm not sure what you mean by this but if you want to replicate gravity on a spaceship than you have to have the entire spaceship spin around in a circular form creating centrifugal which is gravity created by circular motion and theoretically it should have the gravitational pull of mars.
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I think the questioner is asking about an object's "center of gravity", and how do you keep it in the same place on a rocket, or perhaps space ship in general. You would need some internal mechanism to shift matter from place to place (Mercury pumped through conduits?) in the ship to compensate for moving fuel, persons, equipment, etc. This would be a costly thing to do, so you would need to be sure it's necessary for your application. It might be more important but less problematic for the precision deployment of rockets, since they are unmanned and usually have relatively short flights. The ship's center of gravity will be the ship's center of gravity, so the ship will maintain course and speed no matter how many times you tug your way to the observation deck.
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Why center of pressure is below center of gravity?
I assume you are talking about a model rocket. Center of pressure needs to be below center of gravity in order for the rocket to fly straight. Mathematically, the rocket will tilt around the center of gravity but appear to be pushed from the center of pressure, hence the need for the center of pressure to be below the center of gravity, otherwise the rocket will just corkscrew off the pad. The fins move the center of pressure down.
Center of gravity on a rocket?
It is the point on the rocket where it balances it self, with the pull of gravity, and the amount of thrust it applies back on the ground to move up.
Why do you need to put a weight on the nose of the rocket?
Because you can move the center of the gravity farther.
What happens to a person's balance if his center of gravity is lowered?
The lowering of the center of gravity will make it easier for the person to balance. The person will use less muscular energy to maintain his balance with that lower center of gravity.
Why center of pressure is always below cg?
It's not. By your use of the term "center of pressure" I'll make a guess that you're talking about model rocketry. In that case, the center of pressure can be above or below the center of gravity, but you must make it lower in order to make your rocket stable.When a rocket in flight is tipped - say by a gust of wind or some such - it rotates about its center of gravity. (This actually is true of any object in mid air or space, not supported by an outside force.) When the rocket is moving straight along its central axis the fins are not really doing anything. But when the rocket is tipped and its velocity vector is not along its axis, then the fins generate a lateral force, which acts through the center of pressure. (That's what "center of pressure" means.) Now, if the center of pressure is above the center of gravity then the force that the fins apply will make the rocket tip further, and the rocket is unstable. If the center of pressure is below the center of gravity then the force from the fins straightens the rocket out, and the rocket is stable.This is much easier to explain with pictures. See the related link for a fully illustrated explanation.
Where is Center of gravity on a bottle rocket?
In the middle, but it changes constantly as the pressurized liquid leaves the bottle.
When a model rocket is at rest it is being acted upon by balanced forces What are the two forces holding the rocket in place?
The model rocket rests on the center of gravity, which holds it in place. This makes sure the weight of the object is evenly distributed.Ê Another force that holds the rocket the center of pressure. All the aerodynamic forces of the rocket are centered.
If a rocket's thrust equals weight of rocket will the rocket maintain a fixed height?
If and only if all of the thrust is in the opposite direction of the gravity vector ("straight down"). If any of the thrust has horizontal component, it will travel a distance but lose height.
How does gravity help in rocket landing on moon?
There is no gravity in space, therefore there is no gravity to help a rocket landing on the moon.
How does the force of gravity pulling on the rocket change as the distance between it and the planet increases?
Gravity doesn't change, no matter where you are. One of the characteristics of the forces due to gravity is that they're inversely proportional to the square of the distance between the two masses involved. So as your distance from a planet changes, the mutual forces attracting you and the planet toward each other change in inverse proportion to the square of the distance between you and the center of the planet.
How can you tell if the forces are balanced once the rocket is in flight?
You should test your rocket's stability BEFORE you launch! Locate the center of gravity (CG) on your rocket and tie a long string (about 6 feet long) around the body of your rocket at the CG point. Take the other end of the string and swing it over your head around your body. If it flies straight, you're good. If it wobbles or tumbles, then you need to shift the CG more forward of the center point. If you don't know the relationship of "center of gravity" and "center point", you should read up first before you consider launching a rocket. Apogee.com is a great site to learn from. Good luck!
What is the difference between a long rocket fin and a short rocket fin?
A longer fin has increased aerodynamic drag. The geometric relationship between the drag caused by the fins and the center of gravity of the rocket determine the stability of the rocket in flight. Less aerodynamic drag means the rocket can go higher or farther, but it also means the rocket is less stable in flight. This tradeoff has to be considered in the design of the rocket.
