Adding force to actors (pawns, characters), is the same as increasing momentum?

I used a default movement component and added it to a Pawn actor. My pawn can move around by adding force to the physics actor component of my pawn.

Does adding force means to increase/decrease momentum of a pawn, depending on the value of the addend?

If yes, that would mean I could never find a way to reset momentum, set a constant momentum, or get the momentum of a physics actor in C++.