( ( ( Thermal energy ) ( -LRB- ( ( heat energy ) -RRB- ) ) ) ( ( is ( ( ( the ( total ( kinetic energy ) ) ) ( of ( ( atoms and ) molecules ) ) ) ( that ( ( are constantly ) ( in motion ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Thermal) (NN energy)) (PRN (-LRB- -LRB-) (NP (NN heat) (NN energy)) (-RRB- -RRB-))) (VP (VBZ is) (NP (NP (DT the) (JJ total) (JJ kinetic) (NN energy)) (PP (IN of) (NP (NNS atoms) (CC and) (NNS molecules))) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (ADVP (RB constantly)) (PP (IN in) (NP (NN motion)))))))) (. .)))
Thermal energy (heat energy) is the total kinetic energy of atoms and molecules that are constantly in motion.
(ROOT (S (NP (JJ Thermal) (NN energy)) (VP (VBZ constitutes) (NP (NP (DT the) (JJ total) (JJ kinetic) (NN energy)) (PP (IN of) (NP (PDT all) (DT the) (NNS atoms) (SBAR (WHNP (WDT that)) (S (VP (VBP make) (PRT (RP up)) (NP (DT an) (NN object))))))))) (. .)))