As I recall, sitting on a swing when I was younger, I would need to push my feet off the ground to get started.
Younger than that, I would need a push from somebody else.
Please stop confusing general principles with specific personal experiences.
It is of course
more effective to push off the ground by directly applying the strength of your muscles or getting a push from another person.
Especially when you are a child and your feet are very light, your legs are very short and your coordination is less than perfect.
It is also
easier to apply "swinging techniques" once the swing has stared swinging.
This does not alter the fact, that when one mass (feet) is accelerated one way, an equal force will accelerate another mass (rest of body) the other way.
I will move in exactly the opposite direction from where I swung my legs.
No...
No explanation, deserves no response.
At lest under perfect conditions.
As you admit now.
I don't "admit" it as I didn't hide/deny it before.
I'm sorry, but I keep forgetting, that I need to point out the obvious
to avoid misunderstandings.
I had assumed that we all know, that the real world (including experiments) is rarely (if ever) perfect.
Are you aware, that for Joule's Law of Free Expansion, there is a relevant difference between "real" in contrast to "perfect" gases?
If it's some lopsided rope swing or swinging not in line with your center of mass, it won't work that well.
Center of mass for swing is located on the seat of the swing.
It certainly is not. For a sitting body the center of mass is usually somewhere between navel and sternum.
Which makes sense, as most of ones bodily mass is in the upper body.
Force for movement is transmitted through the hips.
It will not move you very far, but it will get you started.
Nope.
No explanation, deserves no response.
You aadmitted differently above.
What do you think I admitted?
It will certainly get you started under perfect conditions. => It works.
Under non-perfect conditions it may not work as well or not at all, but that doesn't change anything.
Under perfect conditions I can easily light a candle with a match. In a storm I likely can't.
Not being able to light a candle with a match in a storm does not prove, it's impossible to prove a candle with a match.
Too bad the videos here clearly demonstrate a rocket requires a pressurized environment to work.
It is not bad, because they don't.
That is your interpretation of the video and that interpretation has been convincingly disputed by several people.
iC
Edited: Added clarification to fix perceived offense.