( Lift ( ( is ( ( another force ) ( exerted ( on ( ( an object ) ( moving ( through ( a fluid ) ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (NNP Lift)) (VP (VBZ is) (NP (NP (DT another) (NN force)) (VP (VBN exerted) (PP (IN on) (NP (NP (DT an) (NN object)) (VP (VBG moving) (PP (IN through) (NP (DT a) (NN fluid))))))))) (: ;)))
Lift is another force exerted on an object moving through a fluid;
(ROOT (S (NP (JJ Bouyant) (NN force)) (VP (VBZ is) (NP (NP (DT the) (JJ upward) (NN force)) (VP (VBN exerted) (PP (IN by) (NP (NP (NNS fluids)) (SBAR (WHADVP (WRB when)) (S (NP (NP (DT any) (NN object)) (, ,) (PP (JJ such) (IN as) (NP (DT a) (NN boat))) (, ,)) (VP (VBZ is) (VP (VBN placed) (PP (IN in) (NP (PRP it)))))))))))) (. .)))