Exam question 2 · Olympiad: forces, floating and machines ★★★

Ascertain the distance from the pivot at which a 40-kilogram child must sit to balance a 20-kilogram child seated 2 metres from it.

Mova's choice: option 1 · The right answer: option 3 · wrong ✗ · Who acts: you, 40-kilogram child, 20-kilogram child · What happens: ascertain, sit, balance, seat · To what, where: distance, pivot, 20-kilogram child, 2 metres

This is exam question 2 of lesson 42 «Olympiad: forces, floating and machines ★★★» of the physics course of Mova's primary school, asked in stiff, formal language. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: the test at school.

The question

The words, one row each (CoNLL-U)

#	word	lemma	UPOS	features	head	relation
1	Ascertain	ascertain	VERB	Mood=Imp VerbForm=Fin	root	root
2	the	the	DET	Definite=Def PronType=Art	3 distance	det
3	distance	distance	NOUN	Number=Sing	1 Ascertain	obj
4	from	from	ADP	_	6 pivot	case
5	the	the	DET	Definite=Def PronType=Art	6 pivot	det
6	pivot	pivot	NOUN	Number=Sing	3 distance	nmod
7	at	at	ADP	_	8 which	case
8	which	which	PRON	PronType=Rel	13 sit	obl
9	a	a	DET	Definite=Ind PronType=Art	11 child	det
10	40-kilogram	40-kilogram	NUM	NumForm=Digit NumType=Card	11 child	nummod
11	child	child	NOUN	Number=Sing	13 sit	nsubj
12	must	must	AUX	VerbForm=Fin	13 sit	aux
13	sit	sit	VERB	VerbForm=Inf	6 pivot	acl:relcl
14	to	to	PART	_	15 balance	mark
15	balance	balance	VERB	VerbForm=Inf	13 sit	xcomp
16	a	a	DET	Definite=Ind PronType=Art	18 child	det
17	20-kilogram	20-kilogram	NUM	NumForm=Digit NumType=Card	18 child	nummod
18	child	child	NOUN	Number=Sing	15 balance	obj
19	seated	seat	VERB	Tense=Past VerbForm=Part Voice=Pass	18 child	acl
20	2	2	NUM	NumForm=Digit NumType=Card	21 metres	nummod
21	metres	metre	NOUN	Number=Plur	19 seated	obl:unmarked
22	from	from	ADP	_	23 it	case
23	it	it	PRON	Case=Acc Gender=Neut Number=Sing Person=3 PronType=Prs	19 seated	obl
24	.	.	PUNCT	_	1 Ascertain	punct

#	verb	tense, mood	who	what, whom	where	other	roles by
1	ascertain	imperative	you not said here	the distance	the pivot		vn discover-84 «NP V NP»: agent=Agent distance=Topic
2	sit	must	a 40-kilogram child		the pivot		tree rules
3	balance	to-infinitive	a 40-kilogram child not said here	a 20-kilogram child			vn spatial_configuration-47.6-1 «PP.location V NP»: agent=Location child=Theme
4	seat	participle	a 20-kilogram child not said here	2 metres		from child	vn fit-54.3 «NP.location V NP»: agent=Location

One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

The options

Option 1 · ← Mova's choice

4 metres

The words, one row each (CoNLL-U)

#	word	lemma	UPOS	features	head	relation
1	4	4	NUM	NumForm=Digit NumType=Card	2 metres	nummod
2	metres	metre	NOUN	Number=Plur	root	root

The frames reader finds no event or fact in this sentence.

Option 2

2 metres

The words, one row each (CoNLL-U)

#	word	lemma	UPOS	features	head	relation
1	2	2	NUM	NumForm=Digit NumType=Card	2 metres	nummod
2	metres	metre	NOUN	Number=Plur	root	root

The frames reader finds no event or fact in this sentence.

Option 3 · ✓ the right answer

1 metre

The words, one row each (CoNLL-U)

#	word	lemma	UPOS	features	head	relation
1	1	1	NUM	NumForm=Digit NumType=Card	2 metre	nummod
2	metre	metre	NOUN	Number=Sing	root	root

The frames reader finds no event or fact in this sentence.

Option 4

Half a metre

The words, one row each (CoNLL-U)

#	word	lemma	UPOS	features	head	relation
1	Half	half	DET	NumForm=Word NumType=Frac PronType=Ind	3 metre	det:predet
2	a	a	DET	Definite=Ind PronType=Art	3 metre	det
3	metre	metre	NOUN	Number=Sing	root	root

The frames reader finds no event or fact in this sentence.

Text: the tests of Mova's primary school, written for Mova (world/data/school/), as the course runner gave them to the student. Trees: Mova's own parse — the en model on the CPU, when the site is built — not checked by a teacher; they may be wrong. Frames: Mova's frames reader (prag), each text read on its own. Elamur Cosmic License.

This page in Markdown → https://md.mova.elamur.ai/free/en/corpora/questions/physics/42-olympiad-forces-floating-and-machines/e2/