How to get permanent force with physics

all of the physics force/movement options look like this:
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while the regular force/movement choices have an option for permanent force:
image

what is the best way to achieve the “permanent force” option with physics? i dont want to keep adding, i want to leave it at a set value, like a variable.

Physics is like real world.
If you want an object to keep moving permanently in the real world, the only solution is outer space (set friction and gravity to 0).

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the issue is, i’d like to set a force instead of adding one. i noticed this setting recently and wanted to apply it to phys. objects. for example, instead of “apply polar force to object” i want it to be “set permanent force of ___ to object” .