---
title: A hot sticky day, bare legs on a metal slide. What happens? — Friction: the grip that stops and helps · tree and pragmatics
description: A hot sticky day, bare legs on a metal slide. What happens? Test 9 of lesson 6 «Friction: the grip that stops and helps» of the physics 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 9 · Friction: the grip that stops and helps

<!-- .ven lang=en -->
A hot sticky day, bare legs on a metal slide. What happens?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 3 · wrong ✗ · **What happens:** happen

<!-- .vabout -->
This is test 9 of lesson 6 «Friction: the grip that stops and helps» of the physics 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/physics/6-friction-the-grip/#t9).

## The question {#question}

<!-- .note -->
*Sentence 1:* A hot sticky day, bare legs on a metal slide.

```conllu
# sent_id = question:physics:6-friction-the-grip:t9:1
# text = A hot sticky day, bare legs on a metal slide.
1	A	a	DET	DT	Definite=Ind|PronType=Art	4	det	_	_
2	hot	hot	ADJ	JJ	Degree=Pos	4	amod	_	_
3	sticky	sticky	ADJ	JJ	Degree=Pos	4	amod	_	_
4	day	day	NOUN	NN	Number=Sing	0	root	_	SpaceAfter=No
5	,	,	PUNCT	,	_	7	punct	_	_
6	bare	bare	ADJ	JJ	Degree=Pos	7	amod	_	_
7	legs	leg	NOUN	NNS	Number=Plur	4	nmod	_	_
8	on	on	ADP	IN	_	11	case	_	_
9	a	a	DET	DT	Definite=Ind|PronType=Art	11	det	_	_
10	metal	metal	NOUN	NN	Number=Sing	11	compound	_	_
11	slide	slide	NOUN	NN	Number=Sing	7	nmod	_	SpaceAfter=No
12	.	.	PUNCT	.	_	4	punct	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

<!-- .note -->
*Sentence 2:* What happens?

```conllu
# sent_id = question:physics:6-friction-the-grip:t9:2
# text = What happens?
1	What	what	PRON	WP	PronType=Int	2	nsubj	_	_
2	happens	happen	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	SpaceAfter=No
3	?	?	PUNCT	.	_	2	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **happen** | present |  |  |  |  |  |  | vn occur-48.3-1 «NP V»: agent=Theme |

## The options {#options}

### Option 1 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
You slide twice as fast

```conllu
# sent_id = question:physics:6-friction-the-grip:t9:o1:1
# text = You slide twice as fast
1	You	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	2	nsubj	_	_
2	slide	slide	VERB	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	0	root	_	_
3	twice	twice	ADV	RB	NumForm=Word|NumType=Mult	2	advmod	_	_
4	as	as	ADV	RB	_	5	advmod	_	_
5	fast	fast	ADV	RB	Degree=Pos	2	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **slide** | present | You |  |  |  |  | fast, twice *property* | vn run-51.3.2-2 «NP V»: agent=Theme |

### Option 2 {#o2}

<!-- .ven lang=en -->
Nothing changes on hot days

```conllu
# sent_id = question:physics:6-friction-the-grip:t9:o2:1
# text = Nothing changes on hot days
1	Nothing	nothing	PRON	NN	Number=Sing|PronType=Neg	2	nsubj	_	_
2	changes	change	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	on	on	ADP	IN	_	5	case	_	_
4	hot	hot	ADJ	JJ	Degree=Pos	5	amod	_	_
5	days	day	NOUN	NNS	Number=Plur	2	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **change** | present | Nothing |  |  |  | day |  | vn dress-41.1.1-1-1 «NP V»: agent=Agent |

### Option 3 · ✓ the right answer {#o3}

<!-- .ven lang=en -->
Your skin grips and squeaks and you slow down

```conllu
# sent_id = question:physics:6-friction-the-grip:t9:o3:1
# text = Your skin grips and squeaks and you slow down
1	Your	your	PRON	PRP$	Case=Gen|Person=2|Poss=Yes|PronType=Prs	3	nmod:poss	_	_
2	skin	skin	NOUN	NN	Number=Sing	3	nsubj	_	_
3	grips	grip	NOUN	NNS	Number=Plur	8	nsubj	_	_
4	and	and	CCONJ	CC	_	5	cc	_	_
5	squeaks	squeak	NOUN	NNS	Number=Plur	3	conj	_	_
6	and	and	CCONJ	CC	_	8	cc	_	_
7	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	8	nsubj	_	_
8	slow	slow	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
9	down	down	ADP	RP	_	8	compound:prt	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **grip** |  | skin |  |  |  |  |  | tree rules |
| 2 | **slow down** | present | Your grips and squeaks |  |  |  |  |  | vn other\_cos-45.4 «NP.patient V»: agent=Patient |

### Option 4 {#o4}

<!-- .ven lang=en -->
The slide gets slippery

```conllu
# sent_id = question:physics:6-friction-the-grip:t9:o4:1
# text = The slide gets slippery
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	slide	slide	NOUN	NN	Number=Sing	3	nsubj	_	_
3	gets	get	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	slippery	slippery	ADJ	JJ	Degree=Pos	3	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **get** | present | the slide |  |  |  |  | slippery *property* | vn comprehend-87.2-1 «NP V S\_ING»: agent=Experiencer |

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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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