( ( In physics ) ( , ( ( mechanical energy ) ( ( describes ( ( the sum ) ( of ( ( potential ( energy ( and ( kinetic ( energy present ) ) ) ) ) ( in ( ( the components ) ( of ( a ( mechanical system ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NN physics))) (, ,) (NP (JJ mechanical) (NN energy)) (VP (VBZ describes) (NP (NP (DT the) (NN sum)) (PP (IN of) (NP (NP (JJ potential) (NN energy) (CC and) (JJ kinetic) (NN energy) (NN present)) (PP (IN in) (NP (NP (DT the) (NNS components)) (PP (IN of) (NP (DT a) (JJ mechanical) (NN system))))))))) (. .)))
In physics, mechanical energy describes the sum of potential energy and kinetic energy present in the components of a mechanical system.
(ROOT (S (NP (NP (DT The) (NN sum)) (PP (IN of) (NP (NP (DT the) (JJ kinetic) (CC and) (JJ potential) (NNS energies)) (PP (IN of) (NP (NP (DT a) (NN system) (POS 's)) (NNS atoms) (CC and) (NNS molecules)))))) (VP (VBZ is) (VP (VBN called) (NP (JJ internal) (NN energy)))) (. .)))