( ( ( These ( two effects ) ) ( -LRB- ( ( lowered ( ( ( electrostatic ( potential energy ) ) and ) ( lowered ( kinetic energy ) ) ) ) -RRB- ) ) ) ( ( ( reduce ( the ( total energy ) ) ) ( when ( ( the ( two atoms ) ) touch ) ) ) . ) )
(ROOT (S (NP (NP (DT These) (CD two) (NNS effects)) (PRN (-LRB- -LRB-) (VP (VBN lowered) (NP (NP (JJ electrostatic) (JJ potential) (NN energy)) (CC and) (NP (VBN lowered) (JJ kinetic) (NN energy)))) (-RRB- -RRB-))) (VP (VB reduce) (NP (DT the) (JJ total) (NN energy)) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (CD two) (NNS atoms)) (VP (VB touch))))) (. .)))
These two effects (lowered electrostatic potential energy and lowered kinetic energy) reduce the total energy when the two atoms touch.
(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))))))))) (. .)))