---
title: Rough surfaces make more friction than smooth ones: a sledge slides… — Forces — pushes, pulls, friction and magnets · tree and pragmatics
description: Rough surfaces make more friction than smooth ones: a sledge slides far on smooth ice but stops quickly on grass or gravel. Who acts: Rough surfaces, sledge. A sentence of the lesson «Forces — pushes, pulls, friction and magnets» of the world course of Mova's primary school with its dependency tree 
---

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# Forces — pushes, pulls, friction and magnets, sentence 6

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Rough surfaces make more friction than smooth ones: a sledge slides far on smooth ice but stops quickly on grass or gravel.

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**Who acts:** Rough surfaces, sledge · **What happens:** make, slide, stop · **To what, where:** more friction, smooth ice, grass

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This is a sentence of the lesson «Forces — pushes, pulls, friction and magnets» 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 (Rough surfaces, sledge), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:world:051-forces.lesson:6
# text = Rough surfaces make more friction than smooth ones: a sledge slides far on smooth ice but stops quickly on grass or gravel.
# source = school lesson (ours)
# course = world
# lesson = 051-forces.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	Rough	rough	ADJ	JJ	Degree=Pos	2	amod	_	_
2	surfaces	surface	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	make	make	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	more	more	ADJ	JJR	Degree=Cmp	5	amod	_	_
5	friction	friction	NOUN	NN	Number=Sing	3	obj	_	_
6	than	than	ADP	IN	_	8	case	_	_
7	smooth	smooth	ADJ	JJ	Degree=Pos	8	amod	_	_
8	ones	one	NOUN	NNS	Number=Plur	5	nmod	_	_
9	:	:	PUNCT	:	_	12	punct	_	_
10	a	a	DET	DT	Definite=Ind|PronType=Art	11	det	_	_
11	sledge	sledge	NOUN	NN	Number=Sing	12	nsubj	_	_
12	slides	slide	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	parataxis	_	Agree=R7-rel-agree|Haiku=3:conj
13	far	far	ADV	RB	Degree=Pos	12	advmod	_	_
14	on	on	ADP	IN	_	16	case	_	_
15	smooth	smooth	ADJ	JJ	Degree=Pos	16	amod	_	_
16	ice	ice	NOUN	NN	Number=Sing	12	obl	_	_
17	but	but	CCONJ	CC	_	18	cc	_	_
18	stops	stop	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	12	conj	_	_
19	quickly	quickly	ADV	RB	_	18	advmod	_	_
20	on	on	ADP	IN	_	21	case	_	_
21	grass	grass	NOUN	NN	Number=Sing	18	obl	_	_
22	or	or	CCONJ	CC	_	23	cc	_	_
23	gravel	gravel	NOUN	NN	Number=Sing	21	conj	_	_
24	.	.	PUNCT	.	_	3	punct	_	_
```

## Pragmatics {#pragmatics}

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- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: changed act=assert

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **make** | present | Rough surfaces | more friction |  |  |  | than smooth ones | vn build-26.1-1 «NP.asset V NP»: agent=Asset friction=Product |
| 2 | **slide** | present | a sledge |  |  | smooth ice |  | far *property* | vn run-51.3.2-2 «NP V PP.location»: agent=Theme on ice=Trajectory |
| 3 | **stop** | present | a sledge *not said here* |  |  | grass or gravel |  | quickly *property* | vn stop-55.4-1-1 «NP.eventuality V»: agent=Eventuality |

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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:051-forces.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): 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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