--- title: Skateboard wheels and bearings have little friction, so a smooth pat… — Rockets, record speeds and motion everywhere · tree and pragmatics description: Skateboard wheels and bearings have little friction, so a smooth path keeps you rolling, but small wheels catch on gravel, and wrist guards and helmets protect against the falls. Who acts: Skateboard wheels, smooth path, you, small wheels. A sentence of the lesson «Rockets, record speeds and motion --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/17/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Physics](https://md.mova.elamur.ai/free/en/corpora/school/physics/) / [Rockets, record speeds and motion ever…](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/) / 17 # Rockets, record speeds and motion everywhere, sentence 17 Skateboard wheels and bearings have little friction, so a smooth path keeps you rolling, but small wheels catch on gravel, and wrist guards and helmets protect against the falls. **Who acts:** Skateboard wheels, smooth path, you, small wheels · **What happens:** have, keep, roll, catch, protect · **To what, where:** little friction, you, gravel This is a sentence of the lesson «Rockets, record speeds and motion everywhere» of the physics 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 (Skateboard wheels, smooth path, you, small wheels), what happens, when and where, as Mova's frames read it from the tree. ## The tree {#tree} ```conllu # sent_id = school:physics:038-rockets-record-speeds-and-motion-everywhere.lesson:17 # text = Skateboard wheels and bearings have little friction, so a smooth path keeps you rolling, but small wheels catch on gravel, and wrist guards and helmets protect against the falls. # source = school lesson (ours) # course = physics # lesson = 038-rockets-record-speeds-and-motion-everywhere.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): R5-strong ×1, R6-punct-agree ×1 1 Skateboard skateboard NOUN NN Number=Sing 2 compound _ _ 2 wheels wheel NOUN NNS Number=Plur 5 nsubj _ _ 3 and and CCONJ CC _ 4 cc _ _ 4 bearings bearing NOUN NNS Number=Plur 2 conj _ _ 5 have have VERB VBP Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin 0 root _ _ 6 little little ADJ JJ Degree=Pos 7 amod _ _ 7 friction friction NOUN NN Number=Sing 5 obj _ _ 8 , , PUNCT , _ 13 punct _ _ 9 so so ADV RB _ 13 advmod _ _ 10 a a DET DT Definite=Ind|PronType=Art 12 det _ _ 11 smooth smooth ADJ JJ Degree=Pos 12 amod _ _ 12 path path NOUN NN Number=Sing 13 nsubj _ _ 13 keeps keep VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 5 conj _ _ 14 you you PRON PRP Case=Acc|Person=2|PronType=Prs 13 obj _ _ 15 rolling roll VERB VBG VerbForm=Ger 13 xcomp _ _ 16 , , PUNCT , _ 20 punct _ Agree=R6-punct-agree|Haiku=29:punct 17 but but CCONJ CC _ 20 cc _ _ 18 small small ADJ JJ Degree=Pos 19 amod _ _ 19 wheels wheel NOUN NNS Number=Plur 20 nsubj _ _ 20 catch catch VERB VBP Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin 5 conj _ _ 21 on on ADP IN _ 22 case _ _ 22 gravel gravel NOUN NN Number=Sing 20 obl _ _ 23 , , PUNCT , _ 26 punct _ _ 24 and and CCONJ CC _ 26 cc _ _ 25 wrist wrist NOUN NN Number=Sing 26 compound _ _ 26 guards guard NOUN NNS Number=Plur 19 conj _ _ 27 and and CCONJ CC _ 28 cc _ _ 28 helmets helmet NOUN NNS Number=Plur 26 conj _ Agree=R5-strong|Haiku=19:conj 29 protect protect VERB VBP Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin 5 conj _ _ 30 against against ADP IN _ 32 case _ _ 31 the the DET DT Definite=Def|PronType=Art 32 det _ _ 32 falls fall NOUN NNS Number=Plur 29 obl _ _ 33 . . PUNCT . _ 5 punct _ _ ``` ## Pragmatics {#pragmatics} No stored speech act for this sentence. | # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | **have** | present | Skateboard wheels and bearings | little friction | | | | | vn birth-28.2-1 «NP V NP»: agent=Agent friction=Patient | | 2 | **keep** | present | a smooth path | you | | | | | tree rules | | 3 | **roll** | gerund | you *not said here* | | | | | | vn run-51.3.2-2 «NP V»: agent=Theme | | 4 | **catch** | present | small wheels and wrist guards and helmets | | | gravel | | | vn get-13.5.1 «NP V NP»: agent=Agent | | 5 | **protect** | present | Skateboard wheels and bearings *not said here* | | | | | against the falls | vn defend-72.3 «NP V NP PP.theme»: agent=Agent against fall=Theme | 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. **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:physics:038-rockets-record-speeds-and-motion-everywhere.lesson:17`. **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): R5-strong ×1, R6-punct-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/). - ← previous: [Rockets, record speeds and motion ever…, 16](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/16/) - next →: [Day and night, and the Moon's faces, 0](https://md.mova.elamur.ai/free/en/corpora/school/physics/39-day-and-night-and-the-moons-faces/0/) - ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/)