Is it possible to "violate" momentum at the expense of more energy?

[gggnano]

TL;DR Summary

Produce thrust in a closed chamber when the opposite momentum is compensated with more energy?

This is in fact a shamelessly simple question to a point the reason it puzzles me is because it's too simple:

So basically you have a closed empty/hollow cylinder filled with either gas or even an ordinary solid ball...and then on the left side of the cylinder you put a force on the "fuel" (gas/ball...) so that it moves to the other side and hits it producing movement. Now, since the ball will come back once it hits the right side then can you produce movement ONLY in one direction for as long as you increase the energy from the left side that pushes the ball?

In fact this idea is very similar to the "emdrive" concept:

http://nerdist.com/wp-content/uploads/2014/08/EmDrive.jpg

Yet I am not sure if the "emdrive" design realizes they will need more and more energy to battle the bouncing wave so perpetuum mobile is impossible?

And if this is possible at tall then you may say it's useless since you need more and more energy to combat momentum yet notice how if you have strong amount of heat but limited amount of fuel this is very useful. For example: you can use million degrees hot nuclear reaction in a rocket but you cannot find fuel in the cosmos to recharge the rocket...well it's not easy...thank you!

 

[hmmm27]

You can do anything you want if you have a sufficient supply of ""s.

Other than that, from what I can parse, you might consider that "putting a force" on the inside component to make it go to the right will cause the outside component to go to the left. No matter what you do, the centre-of-mass stays in the same place.

(If I remember, correctly) the Em drive is supposed to use some abstract group property of EMR ; the illustration you've linked to simply shows a fancier version of what you've got... which doesn't work.

 

[DrClaude]

As @hmmm27 said, no, this can't work.

Discussion of Em drives is not allowed at PF https://www.physicsforums.com/threads/nasas-em-drive.884753/

Thread closed.