total force after using addforce

thanks for your answer.
sorry for my trivial question.
yes. but i don’t know how to do it in lammps?
which command should i use?
Best

thanks for your answer.
sorry for my trivial question.
yes. but i don't know how to do it in lammps?

yet, that is the wrong approach. before looking into what command exactly
would be needed in LAMMPS, you need to understand, how adding a force
through using fix addforce will change the force between two groups.

which command should i use?

​start with a piece of paper and a pencil. make some simplified model and
start thinking!

depending on your system and your specific fix addforce command, you may be
able to fully pre-compute ​the impact of fix addforce. you may even find
that it has no impact at all. like i said previously, this all comes down
to a little bit of vector algebra.

axel.