Rocket Thrust: Power Your Launch Into Space

In summary, rocket thrust is the force that propels a rocket into space. This power is generated by the controlled explosion of fuel and oxidizer in the rocket's engines. The amount of thrust needed depends on the weight of the rocket and the force of gravity. To achieve enough thrust for a successful launch, rockets often use multiple stages, with each stage providing a boost of thrust before it separates and falls back to Earth. The strength and direction of rocket thrust can also be controlled by adjusting the nozzle of the engine, allowing for precise movements and adjustments during flight. Without rocket thrust, space exploration and travel would not be possible.
  • #1
TkoT
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TL;DR Summary
Confusion of thrust of a rocket
I saw the information of thrust of a rocket in the hyperphysics website, but I cant understand it.
1.why do the problem need to observe in two frame ( from an external framework and rocket frame of)?
2.why do the exhaust velocity relative to the rocket u=u+deltav-U?

Thank You
thrust of rocket2.png
 
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  • #2
The reference frame of the rocket is the easiest one. You can always choose whatever reference frame you want but why make it harder than needed?
2.why do the exhaust velocity relative to the rocket u=u+deltav-U?
Where do you get that from? The exhaust velocity relative to the rocket is u which is not equal to u+deltav-U.
 
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  • #3
mfb said:
The reference frame of the rocket is the easiest one. You can always choose whatever reference frame you want but why make it harder than needed?Where do you get that from? The exhaust velocity relative to the rocket is u which is not equal to u+deltav-U.
typo,why do the exhaust velocity relative to the rocket u=v+deltav-U? should be "v" not "u".
i get the information from this website: http://hyperphysics.phy-astr.gsu.edu/hbase/rocket.html#c1
thank u for your reply
 
  • #4
The rocket speed after expelling the exhaust is v+delta v, the ejected material moves at U by definition. They just calculate the difference, which is v + delta v - U
 
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What is rocket thrust?

Rocket thrust is the force that propels a rocket into space. It is created by the expulsion of exhaust gases at high speeds through a nozzle, according to Newton's third law of motion.

How is rocket thrust generated?

Rocket thrust is generated by the combustion of fuel and an oxidizer in the rocket's engine. This creates a high-pressure gas that is expelled through a nozzle, creating a reaction force in the opposite direction, propelling the rocket forward.

What factors affect rocket thrust?

The amount and type of fuel used, the design and efficiency of the rocket engine, and the velocity of the exhaust gases are all factors that can affect the amount of thrust generated by a rocket.

How is rocket thrust measured?

Rocket thrust is typically measured in units of force, such as newtons or pounds, using a device called a thrust stand. This device measures the amount of force produced by the rocket engine and can also calculate the specific impulse, or efficiency, of the engine.

Why is rocket thrust important for space travel?

Rocket thrust is essential for space travel because it provides the necessary force to overcome Earth's gravity and propel a rocket into space. Without rocket thrust, it would be impossible to launch spacecraft and explore the vastness of the universe.

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