It was known that a moving body exchanges its kinetic energy for potential energy when it gains height.
1	It	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	3	expl	3:expl	Discourse=context-background:97->100:2|Entity=(163-abstract-new-cf2-1-cata)
2	was	be	AUX	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	3	aux:pass	3:aux:pass	_
3	known	know	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	0:root	_
4	that	that	SCONJ	IN	_	8	mark	8:mark	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	7:det	Entity=(163-abstract-acc:com-cf2-4-coref(164-object-new-cf1-3-coref
6	moving	moving	ADJ	JJ	Degree=Pos	7	amod	7:amod	_
7	body	body	NOUN	NN	Number=Sing	8	nsubj	8:nsubj	Entity=164)
8	exchanges	exchange	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	csubj:pass	3:csubj:pass	_
9	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	11	nmod:poss	11:nmod:poss	Entity=(165-abstract-new-cf3-3-sgl(164-object-giv:act-cf1-1-ana)
10	kinetic	kinetic	ADJ	JJ	Degree=Pos	11	amod	11:amod	_
11	energy	energy	NOUN	NN	Number=Sing	8	obj	8:obj	Entity=165)
12	for	for	ADP	IN	_	14	case	14:case	_
13	potential	potential	ADJ	JJ	Degree=Pos	14	amod	14:amod	Entity=(166-abstract-new-cf5-2-sgl
14	energy	energy	NOUN	NN	Number=Sing	8	obl	8:obl:for	Entity=166)
15	when	when	ADV	WRB	PronType=Int	17	advmod	17:advmod	Discourse=context-circumstance:98->97:0
16	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	17	nsubj	17:nsubj	Entity=(164-object-giv:act-cf1-1-ana)
17	gains	gain	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	8	advcl	8:advcl:when	_
18	height	height	NOUN	NN	Number=Sing	17	obj	17:obj	Entity=(167-abstract-new-cf4-1-sgl)163)|SpaceAfter=No
19	.	.	PUNCT	.	_	3	punct	3:punct	_
