---
title: You push your skateboard once on a smooth path and it rolls for ages… — Rockets, record speeds and motion ever… · tree and pragmatics
description: You push your skateboard once on a smooth path and it rolls for ages; on gravel it stops at once. Why? Test 12 · ★★★ of lesson 38 «Rockets, record speeds and motion everywhere» of the physics course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option;
---

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# Test 12 · ★★★ · Rockets, record speeds and motion everywhere

<!-- .ven lang=en -->
You push your skateboard once on a smooth path and it rolls for ages; on gravel it stops at once. Why?

<!-- .vintro -->
**Mova's choice:** option 2 · **The right answer:** option 2 · right ✓ · **Who acts:** You, skateboard · **What happens:** push, roll, stop · **To what, where:** skateboard, smooth path, gravel

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This is test 12 · ★★★ of lesson 38 «Rockets, record speeds and motion everywhere» 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/38-rockets-record-speeds-and-motion-everywhere/#t12).

## The question {#question}

<!-- .note -->
*Sentence 1:* You push your skateboard once on a smooth path and it rolls for ages; on gravel it stops at once.

```conllu
# sent_id = question:physics:38-rockets-record-speeds-and-motion-everywhere:t12:1
# text = You push your skateboard once on a smooth path and it rolls for ages; on gravel it stops at once.
1	You	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	2	nsubj	_	_
2	push	push	VERB	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	0	root	_	_
3	your	your	PRON	PRP$	Case=Gen|Person=2|Poss=Yes|PronType=Prs	4	nmod:poss	_	_
4	skateboard	skateboard	NOUN	NN	Number=Sing	2	obj	_	_
5	once	once	ADV	RB	NumForm=Word|NumType=Mult	2	advmod	_	_
6	on	on	ADP	IN	_	9	case	_	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	9	det	_	_
8	smooth	smooth	ADJ	JJ	Degree=Pos	9	amod	_	_
9	path	path	NOUN	NN	Number=Sing	2	obl	_	_
10	and	and	CCONJ	CC	_	12	cc	_	_
11	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	12	nsubj	_	_
12	rolls	roll	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	2	conj	_	_
13	for	for	ADP	IN	_	14	case	_	_
14	ages	age	NOUN	NNS	Number=Plur	12	obl	_	SpaceAfter=No
15	;	;	PUNCT	:	_	19	punct	_	_
16	on	on	ADP	IN	_	17	case	_	_
17	gravel	gravel	NOUN	NN	Number=Sing	19	obl	_	_
18	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	19	nsubj	_	_
19	stops	stop	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	2	conj	_	_
20	at	at	ADP	IN	_	21	case	_	_
21	once	once	ADV	RB	NumForm=Word|NumType=Mult	19	obl	_	SpaceAfter=No
22	.	.	PUNCT	.	_	2	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **push** | present | You | your skateboard |  | a smooth path |  | once *property* | vn funnel-9.3-1-1 «NP V NP PP.trajectory»: agent=Agent skateboard=Theme on path=Trajectory |
| 2 | **roll** | present | skateboard |  |  |  | for ages |  | vn run-51.3.2-2 «NP V»: agent=Theme |
| 3 | **stop** | present | skateboard |  |  | gravel |  |  | vn lodge-46 «NP V PP.location»: agent=Theme at once=Location |

<!-- .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.

<!-- .note -->
*Sentence 2:* Why?

```conllu
# sent_id = question:physics:38-rockets-record-speeds-and-motion-everywhere:t12:2
# text = Why?
1	Why	why	ADV	WRB	PronType=Int	0	root	_	SpaceAfter=No
2	?	?	PUNCT	.	_	1	punct	_	_
```

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

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
Gravel is always uphill

```conllu
# sent_id = question:physics:38-rockets-record-speeds-and-motion-everywhere:t12:o1:1
# text = Gravel is always uphill
1	Gravel	gravel	NOUN	NN	Number=Sing	4	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
3	always	always	ADV	RB	PronType=Tot	4	advmod	_	_
4	uphill	uphill	ADJ	JJ	Degree=Pos	0	root	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | Gravel |  |  |  |  | always, uphill *property* | tree rules |

### Option 2 · ← Mova's choice · ✓ the right answer {#o2}

<!-- .ven lang=en -->
On gravel the small wheels catch on stones and friction grows

```conllu
# sent_id = question:physics:38-rockets-record-speeds-and-motion-everywhere:t12:o2:1
# text = On gravel the small wheels catch on stones and friction grows
1	On	on	ADP	IN	_	2	case	_	_
2	gravel	gravel	NOUN	NN	Number=Sing	6	obl	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
4	small	small	ADJ	JJ	Degree=Pos	5	amod	_	_
5	wheels	wheel	NOUN	NNS	Number=Plur	6	nsubj	_	_
6	catch	catch	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
7	on	on	ADP	IN	_	8	case	_	_
8	stones	stone	NOUN	NNS	Number=Plur	6	obl	_	_
9	and	and	CCONJ	CC	_	11	cc	_	_
10	friction	friction	NOUN	NN	Number=Sing	11	nsubj	_	_
11	grows	grow	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	conj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **catch** | present | the small wheels |  |  | gravel |  | on stones | vn get-13.5.1 «NP V NP»: agent=Agent |
| 2 | **grow** | present | friction |  |  |  |  |  | vn appear-48.1.1 «NP V»: agent=Theme |

### Option 3 {#o3}

<!-- .ven lang=en -->
The smooth path pushes the board along

```conllu
# sent_id = question:physics:38-rockets-record-speeds-and-motion-everywhere:t12:o3:1
# text = The smooth path pushes the board along
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	smooth	smooth	ADJ	JJ	Degree=Pos	3	amod	_	_
3	path	path	NOUN	NN	Number=Sing	4	nsubj	_	_
4	pushes	push	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	board	board	NOUN	NN	Number=Sing	4	obj	_	_
7	along	along	ADV	RB	_	4	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **push** | present | the smooth path | the board |  |  |  | along *property* | vn carry-11.4-1-1 «NP V NP»: agent=Agent board=Theme |

### Option 4 {#o4}

<!-- .ven lang=en -->
Gravel pulls the board down with magnets

```conllu
# sent_id = question:physics:38-rockets-record-speeds-and-motion-everywhere:t12:o4:1
# text = Gravel pulls the board down with magnets
1	Gravel	gravel	NOUN	NN	Number=Sing	2	nsubj	_	_
2	pulls	pull	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
4	board	board	NOUN	NN	Number=Sing	2	obj	_	_
5	down	down	ADP	RP	_	2	compound:prt	_	_
6	with	with	ADP	IN	_	7	case	_	_
7	magnets	magnet	NOUN	NNS	Number=Plur	2	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **pull down** | present | Gravel | the board |  |  |  | with magnets | vn push-12-1 «NP V NP»: agent=Agent board=Theme |

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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: [Rockets, record speeds and motion ever…, test 11](https://md.mova.elamur.ai/free/en/corpora/questions/physics/38-rockets-record-speeds-and-motion-everywhere/t11/)
- next →: [Rockets, record speeds and motion ever…, exam 1](https://md.mova.elamur.ai/free/en/corpora/questions/physics/38-rockets-record-speeds-and-motion-everywhere/e1/)
- ↑ back to [Rockets, record speeds and motion everywhere](https://md.mova.elamur.ai/free/en/corpora/questions/physics/38-rockets-record-speeds-and-motion-everywhere/)