The phrase "a force with which" is correct and usable in written English.
It can be used when describing the influence or power that something has in relation to another entity or situation.
Example: "The new policy is a force with which we must contend in our efforts to improve workplace safety."
Alternatives: "an influence that" or "a power that".
"It's a force with which you have to reckon".
Scunthorpe United have become a force with which to be reckoned since Graham Alexander took charge in March.
Germany were one of the lesser teams in Europe until the 1920s, when their manager Otto Nerz transformed them into a force with which to be reckoned.
Long dismissed as terrorist outlaws by Israel and the United States, Hamas would have been formally recognized as a force with which to be reckoned and negotiated.
Now, with "Scary Movie" -- marked by a broad tone and an interracial cast that includes Carmen Electra and Shannon Elizabeth -- they have established themselves as a force with which Hollywood will gladly reckon.
The said article goes on to dramatically conclude: "He is likely to remain a formidable figure in British politics – and a force with which David Cameron and his advisers had best learn to reckon".
The program also serves as a potent force with which to enhance science education and science literacy.
By the 17th century it had built up a cavalry force with which it dominated people in western Yorubaland and in the dry gap to the coast; to the south, infestations of tsetse flies prevented kingdoms there from effectively utilizing horses.
It can renew itself and become again a national force with which to be reckoned.
Syriza exemplifies a political force with which the EU's institutions will need to contend, as anti-establishment movements across the EU find their political voice, as well as representation in both national and EU levels of office.
The Geneva Conventions and our Constitution make clear that any member of an enemy force with which we are engaged in armed combat may, upon capture, be held in military confinement for as long as hostilities persist.
