---
title: Why does a maglev train hardly lose any speed to friction? — Magnets: pulling and pushing without t… · tree and pragmatics
description: Why does a maglev train hardly lose any speed to friction? Test 9 of lesson 29 «Magnets: pulling and pushing without touching» 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 · Magnets: pulling and pushing without touching

<!-- .ven lang=en -->
Why does a maglev train hardly lose any speed to friction?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **What happens:** do, lose · **To what, where:** maglev train, speed

<!-- .vabout -->
This is test 9 of lesson 29 «Magnets: pulling and pushing without touching» 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/29-magnets-pulling-and-pushing-without-touching/#t9).

## The question {#question}

```conllu
# sent_id = question:physics:29-magnets-pulling-and-pushing-without-touching:t9:1
# text = Why does a maglev train hardly lose any speed to friction?
1	Why	why	ADV	WRB	PronType=Int	7	advmod	_	_
2	does	do	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	advcl	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
4	maglev	maglev	NOUN	NN	Number=Sing	5	compound	_	_
5	train	train	NOUN	NN	Number=Sing	2	obj	_	_
6	hardly	hardly	ADV	RB	_	7	advmod	_	_
7	lose	lose	VERB	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|VerbForm=Fin	0	root	_	_
8	any	any	DET	DT	PronType=Ind	9	det	_	_
9	speed	speed	NOUN	NN	Number=Sing	7	obj	_	_
10	to	to	ADP	IN	_	11	case	_	_
11	friction	friction	NOUN	NN	Number=Sing	7	obl	_	SpaceAfter=No
12	?	?	PUNCT	.	_	7	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **do** | present |  | a maglev train |  |  |  |  | vn act-114-1 «NP V NP»: agent=Agent train=Eventuality |
| 2 | **lose** | present |  | any speed |  |  |  | to friction; hardly *property* | vn succeed-74-3-1 «NP V NP»: agent=Agent speed=Eventuality |

<!-- .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 -->
It travels only downhill

```conllu
# sent_id = question:physics:29-magnets-pulling-and-pushing-without-touching:t9:o1:1
# text = It travels only downhill
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	2	nsubj	_	_
2	travels	travel	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	only	only	ADV	RB	_	4	advmod	_	_
4	downhill	downhill	ADV	RB	_	2	advmod	_	_
```

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

### Option 2 · ✓ the right answer {#o2}

<!-- .ven lang=en -->
No wheels touch the track

```conllu
# sent_id = question:physics:29-magnets-pulling-and-pushing-without-touching:t9:o2:1
# text = No wheels touch the track
1	No	no	DET	DT	PronType=Neg	2	det	_	_
2	wheels	wheel	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	touch	touch	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	track	track	NOUN	NN	Number=Sing	3	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **touch** | present | no wheels | the track |  |  |  |  | vn contiguous\_location-47.8-1 «NP V NP»: agent=Theme track=Co-Theme |

### Option 3 {#o3}

<!-- .ven lang=en -->
The track is greased with oil

```conllu
# sent_id = question:physics:29-magnets-pulling-and-pushing-without-touching:t9:o3:1
# text = The track is greased with oil
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	track	track	NOUN	NN	Number=Sing	4	nsubj:pass	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux:pass	_	_
4	greased	grease	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
5	with	with	ADP	IN	_	6	case	_	_
6	oil	oil	NOUN	NN	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **grease** | present · passive |  | the track |  |  |  | with oil | vn butter-9.9 «NP V NP PP.theme»: subject=Destination with oil=Theme |

### Option 4 {#o4}

<!-- .ven lang=en -->
The train is made of feathers

```conllu
# sent_id = question:physics:29-magnets-pulling-and-pushing-without-touching:t9:o4:1
# text = The train is made of feathers
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	train	train	NOUN	NN	Number=Sing	4	nsubj:pass	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux:pass	_	_
4	made	make	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
5	of	of	ADP	IN	_	6	case	_	_
6	feathers	feather	NOUN	NNS	Number=Plur	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **make** | present · passive |  | the train |  |  |  | of feathers | vn build-26.1-1 «NP.asset V NP»: subject=Product |

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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: [Magnets: pulling and pushing without t…, test 8](https://md.mova.elamur.ai/free/en/corpora/questions/physics/29-magnets-pulling-and-pushing-without-touching/t8/)
- next →: [Magnets: pulling and pushing without t…, test 10](https://md.mova.elamur.ai/free/en/corpora/questions/physics/29-magnets-pulling-and-pushing-without-touching/t10/)
- ↑ back to [Magnets: pulling and pushing without touching](https://md.mova.elamur.ai/free/en/corpora/questions/physics/29-magnets-pulling-and-pushing-without-touching/)