---
title: Why do you hold your arms out when walking along a narrow wall? — Balance: the centre of gravity · tree and pragmatics
description: Why do you hold your arms out when walking along a narrow wall? Test 5 · ★ of lesson 8 «Balance: the centre of gravity» of the physics course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was right.
---

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# Test 5 · ★ · Balance: the centre of gravity

<!-- .ven lang=en -->
Why do you hold your arms out when walking along a narrow wall?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 1 · right ✓ · **Who acts:** you · **What happens:** hold out, walk · **To what, where:** arms, narrow wall

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This is test 5 · ★ of lesson 8 «Balance: the centre of gravity» of the physics course of Mova's primary school. 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](https://md.mova.elamur.ai/free/en/school-run/physics/8-balance-the-centre-of-gravity/#t5).

## The question {#question}

```conllu
# sent_id = question:physics:8-balance-the-centre-of-gravity:t5:1
# text = Why do you hold your arms out when walking along a narrow wall?
1	Why	why	ADV	WRB	PronType=Int	4	advmod	_	_
2	do	do	AUX	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	4	aux	_	_
3	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	4	nsubj	_	_
4	hold	hold	VERB	VB	VerbForm=Inf	0	root	_	_
5	your	your	PRON	PRP$	Case=Gen|Person=2|Poss=Yes|PronType=Prs	6	nmod:poss	_	_
6	arms	arm	NOUN	NNS	Number=Plur	4	obj	_	_
7	out	out	ADV	RB	_	4	advmod	_	_
8	when	when	ADV	WRB	PronType=Int	9	advmod	_	_
9	walking	walk	VERB	VBG	Tense=Pres|VerbForm=Part	4	advcl	_	_
10	along	along	ADP	IN	_	13	case	_	_
11	a	a	DET	DT	Definite=Ind|PronType=Art	13	det	_	_
12	narrow	narrow	ADJ	JJ	Degree=Pos	13	amod	_	_
13	wall	wall	NOUN	NN	Number=Sing	9	obl	_	SpaceAfter=No
14	?	?	PUNCT	.	_	4	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **hold out** | present · do-support | you | your arms |  |  |  | out *property* | vn keep-15.2 «NP V NP»: agent=Agent arm=Theme |
| 2 | **walk** | gerund | you *not said here* |  |  | a narrow wall |  |  | vn run-51.3.2-2-1 «NP V PP.location»: agent=Theme along wall=Trajectory |

<!-- .note -->
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 {#options}

### Option 1 · ← Mova's choice · ✓ the right answer {#o1}

<!-- .ven lang=en -->
Like a pole, they help you correct wobbles

```conllu
# sent_id = question:physics:8-balance-the-centre-of-gravity:t5:o1:1
# text = Like a pole, they help you correct wobbles
1	Like	like	ADP	IN	_	3	case	_	_
2	a	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
3	pole	pole	NOUN	NN	Number=Sing	6	obl	_	SpaceAfter=No
4	,	,	PUNCT	,	_	3	punct	_	_
5	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	6	nsubj	_	_
6	help	help	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
7	you	you	PRON	PRP	Case=Acc|Person=2|PronType=Prs	6	obj	_	_
8	correct	correct	ADJ	JJ	Degree=Pos	9	amod	_	_
9	wobbles	wobble	NOUN	NNS	Number=Plur	6	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **help** | present | they | you |  |  |  | like a pole | tree rules |

### Option 2 {#o2}

<!-- .ven lang=en -->
They make you lighter

```conllu
# sent_id = question:physics:8-balance-the-centre-of-gravity:t5:o2:1
# text = They make you lighter
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	2	nsubj	_	_
2	make	make	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	you	you	PRON	PRP	Case=Acc|Person=2|PronType=Prs	2	obj	_	_
4	lighter	light	ADJ	JJR	Degree=Cmp	2	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **make** | present | They | you |  |  |  | light *property* | vn build-26.1-1 «NP.asset V NP»: agent=Asset you=Product |

### Option 3 {#o3}

<!-- .ven lang=en -->
They pull you to the ground

```conllu
# sent_id = question:physics:8-balance-the-centre-of-gravity:t5:o3:1
# text = They pull you to the ground
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	2	nsubj	_	_
2	pull	pull	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	you	you	PRON	PRP	Case=Acc|Person=2|PronType=Prs	2	obj	_	_
4	to	to	ADP	IN	_	6	case	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	ground	ground	NOUN	NN	Number=Sing	2	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **pull** | present | They | you |  | the ground |  |  | vn carry-11.4 «NP V NP PP.destination»: agent=Agent you=Theme to ground=Destination |

### Option 4 {#o4}

<!-- .ven lang=en -->
They catch the wind like sails and lift you up a little

```conllu
# sent_id = question:physics:8-balance-the-centre-of-gravity:t5:o4:1
# text = They catch the wind like sails and lift you up a little
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	2	nsubj	_	_
2	catch	catch	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	wind	wind	NOUN	NN	Number=Sing	2	obj	_	_
5	like	like	ADP	IN	_	6	case	_	_
6	sails	sail	NOUN	NNS	Number=Plur	2	obl	_	_
7	and	and	CCONJ	CC	_	8	cc	_	_
8	lift	lift	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	2	conj	_	_
9	you	you	PRON	PRP	Case=Acc|Person=2|PronType=Prs	8	obj	_	_
10	up	up	ADP	RP	_	8	compound:prt	_	_
11	a	a	DET	DT	Definite=Ind|PronType=Art	12	det	_	_
12	little	little	ADJ	JJ	Degree=Pos	8	obl:unmarked	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **catch** | present | They | the wind |  |  |  | like sails | vn get-13.5.1 «NP V NP»: agent=Agent wind=Theme |
| 2 | **lift up** | present | They *not said here* | you |  |  |  | a little *obl:unmarked* | vn put\_direction-9.4 «NP V NP»: agent=Agent you=Theme |

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**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.

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