---
title: Something tips over only when its centre of gravity goes outside its… — Balance: the centre of gravity · tree and pragmatics
description: Something tips over only when its centre of gravity goes outside its base, so wide, low things are hard to tip. Who acts: Something, centre, low things. A sentence of the lesson «Balance: the centre of gravity» of the physics course of Mova's primary school with its dependency tree and the pragmatic
---

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# Balance: the centre of gravity, sentence 8

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Something tips over only when its centre of gravity goes outside its base, so wide, low things are hard to tip.

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**Who acts:** Something, centre, low things · **What happens:** tip, go over, be · **To what, where:** base

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This is a sentence of the lesson «Balance: the centre of gravity» of the physics course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (Something, centre, low things), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:physics:008-balance-the-centre-of-gravity.lesson:8
# text = Something tips over only when its centre of gravity goes outside its base, so wide, low things are hard to tip.
# source = school lesson (ours)
# course = physics
# lesson = 008-balance-the-centre-of-gravity.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R7-rel-agree ×2
1	Something	something	PRON	NN	Number=Sing|PronType=Ind	2	nsubj	_	_
2	tips	tip	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	over	over	ADP	RP	_	10	compound:prt	_	_
4	only	only	ADV	RB	_	10	advmod	_	_
5	when	when	SCONJ	WRB	_	10	mark	_	_
6	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	7	nmod:poss	_	_
7	centre	centre	NOUN	NN	Number=Sing	10	nsubj	_	_
8	of	of	ADP	IN	_	9	case	_	_
9	gravity	gravity	NOUN	NN	Number=Sing	7	nmod	_	_
10	goes	go	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	2	advcl	_	_
11	outside	outside	ADV	RB	_	10	advmod	_	_
12	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	13	nmod:poss	_	_
13	base	base	NOUN	NN	Number=Sing	10	obl	_	Agree=R7-rel-agree|Haiku=10:obj
14	,	,	PUNCT	,	_	21	punct	_	_
15	so	so	ADV	RB	_	21	advmod	_	_
16	wide	wide	ADV	RB	_	21	advmod	_	_
17	,	,	PUNCT	,	_	16	punct	_	_
18	low	low	ADJ	JJ	Degree=Pos	19	amod	_	_
19	things	thing	NOUN	NNS	Number=Plur	21	nsubj	_	_
20	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	21	cop	_	_
21	hard	hard	ADJ	JJ	Degree=Pos	2	parataxis	_	Agree=R7-rel-agree|Haiku=2:conj
22	to	to	PART	TO	_	23	mark	_	_
23	tip	tip	VERB	VB	VerbForm=Inf	21	xcomp	_	_
24	.	.	PUNCT	.	_	2	punct	_	_
```

## Pragmatics {#pragmatics}

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- form: statement
- act: narrate
- voice: narrator
- polarity: none
- teacher: kept the draft

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **tip** | present | Something |  |  |  |  |  | vn throw-17.1-1-1 «NP V NP»: agent=Agent |
| 2 | **go over** | present | toy's centre of gravity | centre's base |  |  |  | outside *property* | vn occur-48.3-2 «NP V ADV»: agent=Theme |
| 3 | **is** | present | low things |  |  |  |  | hard, wide *property* | tree rules |
| 4 | **tip** | to-infinitive | low things *not said here* |  |  |  |  |  | vn throw-17.1-1-1 «NP V NP»: agent=Agent |

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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.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:physics:008-balance-the-centre-of-gravity.lesson:8`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R7-rel-agree ×2. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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