( ( ( Kinetic energy ) ( -LRB- ( motion -RRB- ) ) ) ( ( is ( converted ( into ( ( thermal energy ) ( -LRB- ( heat -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Kinetic) (NN energy)) (PRN (-LRB- -LRB-) (NP (NN motion)) (-RRB- -RRB-))) (VP (VBZ is) (VP (VBN converted) (PP (IN into) (NP (NP (JJ thermal) (NN energy)) (PRN (-LRB- -LRB-) (NP (NN heat)) (-RRB- -RRB-)))))) (. .)))
Kinetic energy (motion) is converted into thermal energy (heat).
(ROOT (S (NP (JJ Kinetic) (NN energy)) (VP (VBZ is) (NP (NP (DT the) (NN energy)) (PP (IN of) (NP (NN motion))))) (. .)))
Kinetic energy is the energy of motion.