What does a rocket push against in space?

a reply to: Box of Rain

Rides coming soon.
www.abqjournal.com...

a reply to: Phage

He said the same thing in 2004

a reply to: oldcarpy

It clearly proves there is no equal and opposite force from gas movement due to pressure gradient force. You can’t prove that there is.

a reply to: NicSign

And you can't prove you know what your talking about.

The End

a reply to: buddha

It's obviously pushing against the static inertia of aether. The same soup is obviously carrying EM radiation and limiting the speed of EM radiation such as light.
But... the gas from burned fuel has inertia too and it doesnt have unlimited speed and the the exploding/burning/expanding gas behing it is pushing against it obviously.
Why is no one talking about the end of the world?

a reply to: buddha

thats not a how a rocket works. Exhaust doesn't push against the air to propel the chassis forward. The exhaust comes out at high speed and for newtons 3rd equation to balance the rocket must move in the opposite direction with an equal force.

originally posted by: NicSign
a reply to: oldcarpy

It clearly proves there is no equal and opposite force from gas movement due to pressure gradient force. You can’t prove that there is.

Why not? Why would the force of combusting gasses of rocket propellant be magically immune to Newton's Laws?

What's so special about the mass of the gasses being ejected out the back of a rocket?

a reply to: Soylent Green Is People

no the rocket gas is not a action reaction pair just like your hand and ball is not action reaction pair when you drop the ball from a height. you are simply misapplying newton's third law

originally posted by: NicSign
a reply to: Soylent Green Is People

no the rocket gas is not a action reaction pair just like your hand and ball is not action reaction pair when you drop the ball from a height. you are simply misapplying newton's third law

And I, too, would like to know "why not?" It appears you haven't yet answered that.

What is it about the mass of the stuff coming out the back of a rocket that makes you say it acts so differently than any other mass?

Why would the action of pushing that mass not produce a reaction, but the action of pushing any other masses would?

a reply to: mikell

yes i already have

a reply to: NicSign

No, you posted a video made by someone who clearly does not understand Newton's Third Law.

a reply to: NicSign

I watched all of your video - 9 whole minutes filled with stupid, by someone who does not know the difference between a jet engine and a rocket motor and that's just for starters.

You Flat Earthers are quite entertaining though. Please post some FE threads - I could do with a laugh.

originally posted by: mikell
a reply to: NicSign

And you can't prove you know what your talking about.

The End

But he has proved he does not know what he is talking about.

a reply to: oldcarpy

But, but, but, pressure gradient force, there is no proof rockets work in space, it’s all hearsay, all lies, YouTube, and stuff.....

originally posted by: NicSign
a reply to: mikell

yes i already have

If you can't figure out why there is no force pushing back on your hands when you drop something by letting it go, or why there is no force pushing downward on that scale when something is picked up off it, then there is no hope for you.

Or (and I have to think this is more likely) you certainly CAN figure those things out, but you choose to be an intentionally obtuse troll for the ships and giggles you get.

Either way, arguing with you isn't worth my time.

originally posted by: buddha

originally posted by: tinymind
a reply to: buddha

Had you ever considered the possibility of the gasses expansion actually "pushing" against the inside of the engine as it is allowed to escape out the rear.

The thrust actually is measured against the motor.

YES!
bus the gas has very low mass.
and it would be moving away from the rocket.
so it could not push on it much.

so the rocket would only push on a little gas at the back.
compare that to the mas of the ship?

Remember, there is no friction is a vacuum, and once an object moves it will continue to move until a forces acts on it, or accelerate if there is an opposite force, from the combustion it creates.

a reply to: Liquesence

Every comment here does not show prove an equal and opposite force from gas movement due to pressure gradient force. No simple experiment or science to back claims.

What does the combustion of jet fuel yield? A chemical reaction is certainly not force. People think because their high school teacher told them that rockets work in space, it must be true. Despite the lack of evidence and evidence pointing towards rockets not in space

a reply to: Soylent Green Is People

Well then explain why you think there is an opposite force from pressure gradient force?

a reply to: NicSign

These two sources have been cited for you repeatedly.

How do rockets work in the vacuum of space?
A STAFF REPORT FROM THE STRAIGHT DOPE SCIENCE ADVISORY BOARD

www.straightdope.com...

The truth is that the rocket does have something to push against: namely, its own fuel. Let’s illustrate with an example you kids can try at home. First, you need to get yourself into some sort of frictionless situation. Wearing ice skates on a slippery ice rink would be good, or maybe your office has a chair that rolls really well on a hard surface. Next, you’ll need a medicine ball. You are the rocket and the medicine ball is your fuel. Toss the medicine ball. You’ll notice that as you shove the medicine ball forwards, you yourself lurch backwards. Ta-da, the miracle of physics! (If you think this is because the medicine ball pushed on the air, then try the experiment without the medicine ball — just push on the air with your hands, see how far you lurch backwards.)

From NASA General Thrust Equatio

www.grc.nasa.gov...
Thrust is the force which moves a rocket through the air, or through space. Thrust is generated by the propulsion system of the rocket.

How is thrust generated?

Thrust is a mechanical force which is generated through the reaction of accelerating a mass of gas, as explained by Newton's third law of motion. A gas or working fluid is accelerated to the rear and the engine and rocket are accelerated in the opposite direction. To accelerate the gas, we need some kind of propulsion system. We will discuss the details of various propulsion systems on some other pages. For right now, let us just think of the propulsion system as some machine which accelerates a gas.

Please feel free to prove anything you think is a lie from the two quoted sources.

a reply to: neutronflux

"Newton’s Third Law is usually expressed as, “For every action there is an equal and opposite reaction,” and you can also think of it as “Forces always come in pairs.” While you are pushing on the medicine ball, Newton’s Third Law says that the medicine ball is also pushing on you. Thus, you are accelerated by the force acting (backward) on you by the medicine ball. Never mind that it was you who decided to start the pushing in the first place; you can’t push on the ball without having the ball push back. Forces always come in pairs."

I don't disagree with this statement. However, it does not apply to rockets because hot gases move out because of pressure gradient force and not because the rocket pushes it.

Don't you think it is unusual that New York Times came out with a retraction decades later and not sooner? Perhaps New York Times were taken over by those who control the lies.