( ( In ( real life ) ) ( , ( ( ( ( ( ( the ( ( ( small but ) nonzero ) friction ) ) ( ( would eventually ) ( stop you ) ) ) , ) or ) ( you ( would ( ( feel ( ( the ( small bumps ) ) ( of ( the ( imperfect surface ) ) ) ) ) ( if ( you ( were moving ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (JJ real) (NN life))) (, ,) (S (NP (DT the) (ADJP (JJ small) (CC but) (JJ nonzero)) (NN friction)) (VP (MD would) (ADVP (RB eventually)) (VP (VB stop) (NP (PRP you))))) (, ,) (CC or) (S (NP (PRP you)) (VP (MD would) (VP (VB feel) (NP (NP (DT the) (JJ small) (NNS bumps)) (PP (IN of) (NP (DT the) (JJ imperfect) (NN surface)))) (SBAR (IN if) (S (NP (PRP you)) (VP (VBD were) (VP (VBG moving)))))))) (. .)))
In real life, the small but nonzero friction would eventually stop you, or you would feel the small bumps of the imperfect surface if you were moving.
(ROOT (S (NP (NN Friction) (NN force)) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (NP (JJ microscopic) (NNS bumps)) (, ,) (VP (VBZ lumps)) (, ,) (CC and) (NP (NP (NNS imperfections)) (VP (VBG colliding))))))) (. .)))