( FRICTION ( ( HYPOTHESIS ( ( ( The heavier ) ( ( an object ) is ) ) ( , ( ( the ( more friction ) ) ( there ( is ( if ( you ( try ( to ( slide ( the object ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP FRICTION)) (VP (VBZ HYPOTHESIS) (SBAR (S (SBAR (X (DT The) (ADJP (JJR heavier))) (S (NP (DT an) (NN object)) (VP (VBZ is)))) (, ,) (X (DT the) (RBR more) (JJ friction)) (NP (EX there)) (VP (VBZ is) (SBAR (IN if) (S (NP (PRP you)) (VP (VBP try) (S (VP (TO to) (VP (VB slide) (NP (DT the) (NN object)))))))))))) (. .)))
FRICTION HYPOTHESIS The heavier an object is, the more friction there is if you try to slide the object.
(ROOT (S (NP (VBG Sliding) (NN friction)) (VP (VBZ is) (NP (NP (NN friction)) (SBAR (WHNP (WDT that)) (S (VP (VBZ acts) (PP (IN on) (NP (NP (NNS objects)) (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (VBP are) (VP (VBG sliding) (PP (IN over) (NP (DT a) (NN surface)))))))))))))) (. .)))