# Force Extraction
**URL:** https://gromacs.bioexcel.eu/t/force-extraction/9568
**Category:** User discussions
**Tags:** forcefield, mdrun
**Created:** [July 4, 2024, 5:57am UTC](https://gromacs.bioexcel.eu/t/force-extraction/9568 "2024-07-04T05:57:09Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@rscere](https://gromacs.bioexcel.eu/u/rscere)
#### Post date: [July 4, 2024, 5:57am UTC](https://gromacs.bioexcel.eu/t/force-extraction/9568/1 "2024-07-04T05:57:09Z")
GROMACS version: 2024.2
GROMACS modification: No
Hi, I am trying to extract the computing forces after simulation as combined and the different forces which are combined. I was able to some of the forces like Non-Bonded Long Range etc., from the “src/gromacs/mdlib/sim\_util.cpp” but when I add them, they don’t result into the same as combined force. So, what are the different forces that I need and where can I find them?
Thanks.
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### Author:  [@hess](https://gromacs.bioexcel.eu/u/hess)
#### Post date: [July 4, 2024, 11:43am UTC](https://gromacs.bioexcel.eu/t/force-extraction/9568/2 "2024-07-04T11:43:31Z")
This is extremely hard to obtain from the code.
It might be simpler to modify your topology to turn off components and then use gmx mdrun -rerun to produce the forces.
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### Author:  [@rscere](https://gromacs.bioexcel.eu/u/rscere)
#### Post date: [July 4, 2024, 3:18pm UTC](https://gromacs.bioexcel.eu/t/force-extraction/9568/3 "2024-07-04T15:18:51Z")
Ok. BTW is it possible to dump individual forces (components) instead of combined using gmx? Actually, need to verify the individual forces that I am trying to simulate using the force equations through a python-based project.