The plane had engine problems and had to make a 'forced' landing in a field. [=the plane was forced to land in a field]
The pilot was 'forced to land' when one of the plane's engines caught fire.
He was 'forced' to resign from office. = He was 'forced' out of office.
(..) - Hey, don't look at me. I didn't invite them. Oh, gosh, no one invited us. - What? - We were forced to come here. - By who? - . He huffed he puffed he... signed an eviction notice. All right. (..)2001 Shrek