---
title: Rolling makes much less friction than sliding, which is why wheels h… — Pushes, pulls, friction and wheels · tree and pragmatics
description: Rolling makes much less friction than sliding, which is why wheels help. Who acts: Rolling, wheels. 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 21

<!-- .ven lang=en -->
Rolling makes much less friction than sliding, which is why wheels help.

<!-- .vintro -->
**Who acts:** Rolling, wheels · **What happens:** make, slide, be, help · **To what, where:** less friction

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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 (Rolling, wheels), 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:21
# text = Rolling makes much less friction than sliding, which is why wheels help.
# 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	Rolling	rolling	NOUN	NN	Number=Sing	2	nsubj	_	_
2	makes	make	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	much	much	ADV	RB	_	4	advmod	_	_
4	less	less	ADJ	JJR	Degree=Cmp	5	amod	_	_
5	friction	friction	NOUN	NN	Number=Sing	2	obj	_	_
6	than	than	SCONJ	IN	_	7	mark	_	_
7	sliding	slide	VERB	VBG	VerbForm=Ger	4	advcl	_	_
8	,	,	PUNCT	,	_	13	punct	_	_
9	which	which	PRON	WDT	PronType=Rel	10	nsubj	_	_
10	is	be	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	2	parataxis	_	_
11	why	why	ADV	WRB	PronType=Int	13	advmod	_	_
12	wheels	wheel	NOUN	NNS	Number=Plur	13	nsubj	_	_
13	help	help	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	10	ccomp	_	_
14	.	.	PUNCT	.	_	2	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 | **make** | present | Rolling | less friction |  |  |  |  | vn build-26.1-1 «NP.asset V NP»: agent=Asset friction=Product |
| 2 | **slide** | gerund | Rolling *not said here* |  |  |  |  |  | vn run-51.3.2-2 «NP V»: agent=Theme |
| 3 | **be** | present |  |  |  |  |  |  | tree rules |
| 4 | **help** | present | wheels |  |  |  |  |  | vn help-72.1-1-1 «NP V PP.theme»: agent=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:21`.

**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: [Pushes, pulls, friction and wheels, 20](https://md.mova.elamur.ai/free/en/corpora/school/world/85-pushes-pulls-friction-wheels/20/)
- next →: [Pushes, pulls, friction and wheels, 22](https://md.mova.elamur.ai/free/en/corpora/school/world/85-pushes-pulls-friction-wheels/22/)
- ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/world/85-pushes-pulls-friction-wheels/)