( ( ( The energy ) ( of ( ( an object ) ( in motion ) ) ) ) ( ( is ( known ( as ( kinetic energy ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN energy)) (PP (IN of) (NP (NP (DT an) (NN object)) (PP (IN in) (NP (NN motion)))))) (VP (VBZ is) (VP (VBN known) (PP (IN as) (NP (JJ kinetic) (NN energy))))) (. .)))
The energy of an object in motion is known as kinetic energy.
(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.