( ( Mechanical energy ) ( ( changes ( to ( heat ( in ( bicycle brakes ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Mechanical) (NN energy)) (VP (VBZ changes) (S (VP (TO to) (VP (VB heat) (PP (IN in) (NP (NN bicycle) (NNS brakes))))))) (. .)))
Mechanical energy changes to heat in bicycle brakes.
(ROOT (S (NP (DT A) (NN person)) (VP (VBZ uses) (NP (JJ mechanical) (NN energy) (S (VP (TO to) (VP (VB pedal) (NP (DT a) (NN bicycle))))))) (. .)))