---
title: Ball bearings help a wheel turn smoothly on its axle. — Pushes, pulls, friction and wheels · tree and pragmatics
description: Ball bearings help a wheel turn smoothly on its axle. Who acts: Ball bearings, wheel. 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 every clause.
---

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# Pushes, pulls, friction and wheels, sentence 22

<!-- .ven lang=en -->
Ball bearings help a wheel turn smoothly on its axle.

<!-- .vintro -->
**Who acts:** Ball bearings, wheel · **What happens:** help, turn · **To what, where:** wheel, axle

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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 (Ball bearings, wheel), 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:22
# text = Ball bearings help a wheel turn smoothly on its axle.
# 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	Ball	ball	NOUN	NN	Number=Sing	2	compound	_	_
2	bearings	bearing	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	help	help	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
5	wheel	wheel	NOUN	NN	Number=Sing	3	obj	_	_
6	turn	turn	VERB	VB	VerbForm=Inf	3	xcomp	_	_
7	smoothly	smoothly	ADV	RB	_	6	advmod	_	_
8	on	on	ADP	IN	_	10	case	_	_
9	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	10	nmod:poss	_	_
10	axle	axle	NOUN	NN	Number=Sing	6	obl	_	_
11	.	.	PUNCT	.	_	3	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 | **help** | present | Ball bearings | a wheel |  |  |  |  | vn help-72.1-1-1 «NP V NP S\_INF»: agent=Agent wheel=Beneficiary clause=Theme |
| 2 | **turn** | infinitive | a wheel *not said here* |  |  | wheel's axle |  | smoothly *property* | vn roll-51.3.1 «NP V PP.trajectory»: agent=Theme on axle=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.

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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:22`.

**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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