---
title: What would happen if there were no friction at all? — Pushes, pulls, friction and wheels · tree and pragmatics
description: What would happen if there were no friction at all? Test 2 · ★ of lesson 85 «Pushes, pulls, friction and wheels» of the world course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was wrong.
---

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# Test 2 · ★ · Pushes, pulls, friction and wheels

<!-- .ven lang=en -->
What would happen if there were no friction at all?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 4 · wrong ✗ · **Who acts:** friction · **What happens:** happen, be

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This is test 2 · ★ of lesson 85 «Pushes, pulls, friction and wheels» of the world course of Mova's primary school. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/world/85-pushes-pulls-friction-wheels/#t2).

## The question {#question}

```conllu
# sent_id = question:world:85-pushes-pulls-friction-wheels:t2:1
# text = What would happen if there were no friction at all?
1	What	what	PRON	WP	PronType=Int	3	nsubj	_	_
2	would	would	AUX	MD	VerbForm=Fin	3	aux	_	_
3	happen	happen	VERB	VB	VerbForm=Inf	0	root	_	_
4	if	if	SCONJ	IN	_	6	mark	_	_
5	there	there	PRON	EX	PronType=Dem	6	expl	_	_
6	were	be	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	3	advcl	_	_
7	no	no	DET	DT	PronType=Neg	8	det	_	_
8	friction	friction	NOUN	NN	Number=Sing	6	nsubj	_	_
9	at	at	ADP	IN	_	10	case	_	_
10	all	all	DET	DT	PronType=Tot	8	nmod	_	SpaceAfter=No
11	?	?	PUNCT	.	_	3	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **happen** | would |  |  |  |  |  |  | vn occur-48.3-1 «NP V»: agent=Theme |
| 2 | **be** *a condition, not said to happen* | past | no friction at all |  |  | there |  |  | vn exist-47.1 «NP V»: agent=Theme |

<!-- .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.

## The options {#options}

### Option 1 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
Wheels would turn much more slowly

```conllu
# sent_id = question:world:85-pushes-pulls-friction-wheels:t2:o1:1
# text = Wheels would turn much more slowly
1	Wheels	wheel	NOUN	NNS	Number=Plur	3	nsubj	_	_
2	would	would	AUX	MD	VerbForm=Fin	3	aux	_	_
3	turn	turn	VERB	VB	VerbForm=Inf	0	root	_	_
4	much	much	ADV	RB	_	5	advmod	_	_
5	more	more	ADV	RBR	Degree=Cmp	3	advmod	_	_
6	slowly	slowly	ADV	RB	_	3	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **turn** | would | Wheels |  |  |  |  | slowly *property* | vn roll-51.3.1 «NP.theme V»: agent=Theme |

### Option 2 {#o2}

<!-- .ven lang=en -->
Everything would stop moving at once

```conllu
# sent_id = question:world:85-pushes-pulls-friction-wheels:t2:o2:1
# text = Everything would stop moving at once
1	Everything	everything	PRON	NN	Number=Sing|PronType=Tot	3	nsubj	_	_
2	would	would	AUX	MD	VerbForm=Fin	3	aux	_	_
3	stop	stop	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
4	moving	move	VERB	VBG	VerbForm=Ger	3	xcomp	_	_
5	at	at	ADP	IN	_	6	case	_	_
6	once	once	ADV	RB	NumForm=Word|NumType=Mult	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **stop** | would | Everything |  |  |  |  |  | vn stop-55.4-1-1 «NP V S\_ING»: agent=Affector clause=Eventuality |
| 2 | **move** | gerund | Everything *not said here* |  |  |  |  |  | vn roll-51.3.1 «NP V PP.trajectory»: agent=Theme at once=Trajectory |

### Option 3 {#o3}

<!-- .ven lang=en -->
Things would become much heavier

```conllu
# sent_id = question:world:85-pushes-pulls-friction-wheels:t2:o3:1
# text = Things would become much heavier
1	Things	thing	NOUN	NNS	Number=Plur	3	nsubj	_	_
2	would	would	AUX	MD	VerbForm=Fin	3	aux	_	_
3	become	become	VERB	VB	VerbForm=Inf	0	root	_	_
4	much	much	ADV	RB	_	5	advmod	_	_
5	heavier	heavy	ADJ	JJR	Degree=Cmp	3	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **become** | would | Things |  |  |  |  | heavy *property* | vn become-109.1-1-1 «NP V PP.attribute»: agent=Patient |

### Option 4 · ✓ the right answer {#o4}

<!-- .ven lang=en -->
You could not walk without slipping

```conllu
# sent_id = question:world:85-pushes-pulls-friction-wheels:t2:o4:1
# text = You could not walk without slipping
1	You	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	4	nsubj	_	_
2	could	could	AUX	MD	VerbForm=Fin	4	aux	_	_
3	not	not	PART	RB	Polarity=Neg	4	advmod	_	_
4	walk	walk	VERB	VB	VerbForm=Inf	0	root	_	_
5	without	without	SCONJ	IN	_	6	mark	_	_
6	slipping	slip	VERB	VBG	Tense=Pres|VerbForm=Part	4	advcl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **not** **walk** | could | You |  |  |  |  |  | vn run-51.3.2-2-1 «NP V»: agent=Theme |
| 2 | **slip** | gerund | You *not said here* |  |  |  |  |  | vn calibratable\_cos-45.6.1-1 «NP.attribute V»: agent=Attribute |

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**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

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- ← previous: [Pushes, pulls, friction and wheels, test 1](https://md.mova.elamur.ai/free/en/corpora/questions/world/85-pushes-pulls-friction-wheels/t1/)
- next →: [Pushes, pulls, friction and wheels, test 3](https://md.mova.elamur.ai/free/en/corpora/questions/world/85-pushes-pulls-friction-wheels/t3/)
- ↑ back to [Pushes, pulls, friction and wheels](https://md.mova.elamur.ai/free/en/corpora/questions/world/85-pushes-pulls-friction-wheels/)