Alternative to the addforce command

Hey guys am new using Lammps and am trying to simulate a particle on a potential background. I found through reading the manual that the ’ fix addforce ’ command can do that for you. My question is, is there any keyword that can do the same thing as the ’ fix addforce’ command ?

Why not use fix addforce?

Because I saw on the same manual that “fix setforce” is similar to the “addforce” and was thinking that the former can also add a potential background just like the ‘addforce’ and needed confirmation on that. Thanks.

Sorry, but you are not making any sense.

Setting is different than adding.

And you were asking for an alternative. Your response is no explanation at all.

I see my confusion. Thanks.