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What keeps a rocket from rotating around it's center or gravity?
Wiki User
∙ 14y ago
Because the force has only a y vector, but no x vector. same thing with throwing a spear lets say, the force is mostly made up with an x vector, and very little y vector, and therefore it flies almost straight.
Wiki User
∙ 14y ago
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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.
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!
Why do you need to put a weight on the nose of the rocket?
Because you can move the center of the gravity farther.
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.
Why does the earth move around?
the earth moves around because of the suns gravity. Its not rocket science.
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.
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.
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.
What must a rocket overcome to be launched into space?
Alright, it is mainly the force of gravity. This is because if there was no gravity, you do not heat energy to fire the rocket up.
