---
title: A rolling wheel or ball has much less friction than a box sliding, w… — Wheels, axles, ramps and screws · tree and pragmatics
description: A rolling wheel or ball has much less friction than a box sliding, which made the wheel one of the most important inventions in history. Who acts: rolling wheel, box sliding. A sentence of the lesson «Wheels, axles, ramps and screws» of the physics course of Mova's primary school with its dependency
---

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# Wheels, axles, ramps and screws, sentence 12

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A rolling wheel or ball has much less friction than a box sliding, which made the wheel one of the most important inventions in history.

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**Who acts:** rolling wheel, box sliding · **What happens:** roll, have, make · **To what, where:** less friction, wheel

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This is a sentence of the lesson «Wheels, axles, ramps and screws» 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 (rolling wheel, box sliding), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:physics:034-wheels-axles-ramps-and-screws.lesson:12
# text = A rolling wheel or ball has much less friction than a box sliding, which made the wheel one of the most important inventions in history.
# source = school lesson (ours)
# course = physics
# lesson = 034-wheels-axles-ramps-and-screws.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 ×1
1	A	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
2	rolling	roll	VERB	VBG	VerbForm=Ger	3	amod	_	Agree=R7-rel-agree|Haiku=3:compound|HaikuPos=NOUN:NN:Number=Sing
3	wheel	wheel	NOUN	NN	Number=Sing	6	nsubj	_	_
4	or	or	CCONJ	CC	_	5	cc	_	_
5	ball	ball	NOUN	NN	Number=Sing	3	conj	_	_
6	has	have	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
7	much	much	ADV	RB	_	8	advmod	_	_
8	less	less	ADJ	JJR	Degree=Cmp	9	amod	_	_
9	friction	friction	NOUN	NN	Number=Sing	6	obj	_	_
10	than	than	ADP	IN	_	13	case	_	_
11	a	a	DET	DT	Definite=Ind|PronType=Art	13	det	_	_
12	box	box	NOUN	NN	Number=Sing	13	compound	_	_
13	sliding	sliding	NOUN	NN	Number=Sing	9	nmod	_	_
14	,	,	PUNCT	,	_	16	punct	_	_
15	which	which	PRON	WDT	PronType=Rel	16	nsubj	_	_
16	made	make	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	13	acl:relcl	_	_
17	the	the	DET	DT	Definite=Def|PronType=Art	18	det	_	_
18	wheel	wheel	NOUN	NN	Number=Sing	16	obj	_	_
19	one	one	NUM	CD	NumForm=Word|NumType=Card	16	xcomp	_	_
20	of	of	ADP	IN	_	24	case	_	_
21	the	the	DET	DT	Definite=Def|PronType=Art	24	det	_	_
22	most	most	ADV	RBS	Degree=Sup	23	advmod	_	_
23	important	important	ADJ	JJ	Degree=Pos	24	amod	_	_
24	inventions	invention	NOUN	NNS	Number=Plur	19	nmod	_	_
25	in	in	ADP	IN	_	26	case	_	_
26	history	history	NOUN	NN	Number=Sing	24	nmod	_	_
27	.	.	PUNCT	.	_	6	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 | **roll** | gerund |  |  |  |  |  |  | vn run-51.3.2-2 «NP V»: agent=Theme |
| 2 | **have** | present | a rolling wheel or ball | less friction |  |  |  | than a box sliding | vn birth-28.2-1 «NP V NP»: agent=Agent friction=Patient |
| 3 | **make** | past | a box sliding | the wheel |  |  |  |  | vn build-26.1-1 «NP.asset V NP»: agent=Asset wheel=Product |

<!-- .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:physics:034-wheels-axles-ramps-and-screws.lesson:12`.

**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 ×1. **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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