---
title: Wheels roll instead of rub, so a suitcase on wheels moves easily, an… — Living with friction: oil, wheels and grip · tree and pragmatics
description: Wheels roll instead of rub, so a suitcase on wheels moves easily, and before wheels people rolled huge stones on logs. Who acts: Wheels, suitcase, people. A sentence of the lesson «Living with friction: oil, wheels and grip» of the physics course of Mova's primary school with its dependency tree and
---

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# Living with friction: oil, wheels and grip, sentence 6

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Wheels roll instead of rub, so a suitcase on wheels moves easily, and before wheels people rolled huge stones on logs.

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**Who acts:** Wheels, suitcase, people · **What happens:** roll, move · **To what, where:** huge stones, logs

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This is a sentence of the lesson «Living with friction: oil, wheels and grip» 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 (Wheels, suitcase, people), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:physics:007-living-with-friction.lesson:6
# text = Wheels roll instead of rub, so a suitcase on wheels moves easily, and before wheels people rolled huge stones on logs.
# source = school lesson (ours)
# course = physics
# lesson = 007-living-with-friction.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): R5-strong ×1, R6-punct-agree ×2, R8-pos-agree ×1
1	Wheels	wheel	NOUN	NNS	Number=Plur	2	nsubj	_	_
2	roll	roll	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	instead	instead	ADV	RB	ExtPos=ADP	5	case	_	_
4	of	of	ADP	IN	_	3	fixed	_	_
5	rub	rub	NOUN	NN	Number=Sing	2	obl	_	Agree=R8-pos-agree|Haiku=2:obl|HaikuPos=VERB:VB:VerbForm=Inf
6	,	,	PUNCT	,	_	12	punct	_	_
7	so	so	ADV	RB	_	12	advmod	_	_
8	a	a	DET	DT	Definite=Ind|PronType=Art	9	det	_	_
9	suitcase	suitcase	NOUN	NN	Number=Sing	12	nsubj	_	_
10	on	on	ADP	IN	_	11	case	_	_
11	wheels	wheel	NOUN	NNS	Number=Plur	9	nmod	_	_
12	moves	move	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	2	conj	_	_
13	easily	easily	ADV	RB	_	12	advmod	_	_
14	,	,	PUNCT	,	_	19	punct	_	Agree=R6-punct-agree|Haiku=18:punct
15	and	and	CCONJ	CC	_	19	cc	_	_
16	before	before	ADP	IN	_	17	case	_	_
17	wheels	wheel	NOUN	NNS	Number=Plur	19	obl	_	_
18	people	people	NOUN	NNS	Number=Plur	19	nsubj	_	_
19	rolled	roll	VERB	VBD	Mood=Ind|Number=Plur|Person=3|Tense=Past|VerbForm=Fin	2	conj	_	_
20	huge	huge	ADJ	JJ	Degree=Pos	21	amod	_	_
21	stones	stone	NOUN	NNS	Number=Plur	19	obj	_	_
22	on	on	ADP	IN	_	23	case	_	_
23	logs	log	NOUN	NNS	Number=Plur	19	obl	_	Agree=R5-strong|Haiku=21:nmod
24	.	.	PUNCT	.	_	2	punct	_	Agree=R6-punct-agree|Haiku=18:punct
```

## Pragmatics {#pragmatics}

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- form: statement
- act: assert
- 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 | **roll** | present | Wheels |  |  |  |  | instead rub | vn run-51.3.2-2 «NP V»: agent=Theme |
| 2 | **move** | present | a suitcase on wheels |  |  |  |  | easily *property* | vn roll-51.3.1 «NP.theme V»: agent=Theme |
| 3 | **roll** | past | people | huge stones |  | logs | before wheels |  | vn roll-51.3.1 «NP.agent V NP.theme PP.source PP.trajectory PP.destination»: agent=Agent stone=Theme before wheel=Source on log=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:physics:007-living-with-friction.lesson:6`.

**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): R5-strong ×1, R6-punct-agree ×2, R8-pos-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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