---
title: When two forces on an object are equal and opposite, they are balanc… — Pushes, pulls, friction and wheels · tree and pragmatics
description: When two forces on an object are equal and opposite, they are balanced, and the object does not change its movement. Who acts: two forces, object. A sentence of the lesson «Pushes, pulls, friction and wheels» of the world course of Mova's primary school with its dependency tree and the pragmatics of
---

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# Pushes, pulls, friction and wheels, sentence 0

<!-- .ven lang=en -->
When two forces on an object are equal and opposite, they are balanced, and the object does not change its movement.

<!-- .vintro -->
**Who acts:** two forces, object · **What happens:** be, balance, not change, move · **To what, where:** forces, movement

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This is a sentence of the lesson «Pushes, pulls, friction and wheels» of the world 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 (two forces, object), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:world:085-pushes-pulls-friction-wheels.lesson:0
# text = When two forces on an object are equal and opposite, they are balanced, and the object does not change its movement.
# source = school lesson (ours)
# course = world
# lesson = 085-pushes-pulls-friction-wheels.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): no change
1	When	when	ADV	WRB	PronType=Int	8	advmod	_	_
2	two	two	NUM	CD	NumForm=Word|NumType=Card	3	nummod	_	_
3	forces	force	NOUN	NNS	Number=Plur	8	nsubj	_	_
4	on	on	ADP	IN	_	6	case	_	_
5	an	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
6	object	object	NOUN	NN	Number=Sing	3	nmod	_	_
7	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	8	cop	_	_
8	equal	equal	ADJ	JJ	Degree=Pos	14	advcl	_	_
9	and	and	CCONJ	CC	_	10	cc	_	_
10	opposite	opposite	ADJ	JJ	Degree=Pos	8	conj	_	_
11	,	,	PUNCT	,	_	14	punct	_	_
12	they	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	14	nsubj	_	_
13	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	14	aux:pass	_	_
14	balanced	balance	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
15	,	,	PUNCT	,	_	21	punct	_	_
16	and	and	CCONJ	CC	_	21	cc	_	_
17	the	the	DET	DT	Definite=Def|PronType=Art	18	det	_	_
18	object	object	NOUN	NN	Number=Sing	21	nsubj	_	_
19	does	do	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	21	aux	_	_
20	not	not	PART	RB	Polarity=Neg	21	advmod	_	_
21	change	change	VERB	VB	VerbForm=Inf	14	conj	_	_
22	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	23	nmod:poss	_	_
23	movement	movement	NOUN	NN	Number=Sing	21	obj	_	_
24	.	.	PUNCT	.	_	14	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- .note -->
No stored speech act for this sentence.

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | two forces on a object |  |  |  |  | equal *property* | tree rules |
| 2 | **be** |  | two forces on a object *not said here* |  |  |  |  |  | tree rules |
| 3 | **balance** | present · passive |  | forces *= force* |  |  |  |  | vn spatial\_configuration-47.6-1 «PP.location V NP»: subject=Theme |
| 4 | **not** **change** | present · do-support | the object | object's movement |  |  |  |  | vn dress-41.1.1-1-1 «NP V NP»: agent=Agent movement=Patient |
| 5 | **move** |  | object |  |  |  |  |  | nom movement «act transitive»: poss=agent |

<!-- .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.

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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:world:085-pushes-pulls-friction-wheels.lesson:0`.

**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): no change. **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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- ← previous: [Mirrors, shadows and colours, 23](https://md.mova.elamur.ai/free/en/corpora/school/world/84-mirrors-shadows-colours/23/)
- next →: [Pushes, pulls, friction and wheels, 1](https://md.mova.elamur.ai/free/en/corpora/school/world/85-pushes-pulls-friction-wheels/1/)
- ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/world/85-pushes-pulls-friction-wheels/)