--- title: Rockets, record speeds and motion everywhere — a lesson of Mova's school · trees and pragmatics description: «Rockets, record speeds and motion everywhere», a lesson of the physics course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: You can feel the same push back when a garden hose wriggles as the water rushes out, and a squid uses it to shoot backwards b --- [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/) [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… # Rockets, record speeds and motion everywhere Lesson 38 of the physics course of Mova's primary school: 16 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/physics/38-rockets-record-speeds-and-motion-everywhere/). - [1](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/1/) — You can feel the same push back when a garden hose wriggles as the water rushes out, and a squid uses it to shoot backwards by squirting water from a tube. - [3](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/3/) — Even sitting still on your chair you are flying: the Earth spins and races round the Sun at about 100,000 kilometres an hour, and you do not notice because everything moves with you. - [4](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/4/) — Where there is little friction, motion lasts: a curling stone or a skateboard on a smooth path rolls on and on after one push. - [5](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/5/) — A rocket throws hot gas out downwards and the gas pushes the rocket up; it does not need air to push against. - [6](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/6/) — Rockets work best in space, where there is no air to slow them. - [7](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/7/) — To circle the Earth, a rocket must move at about 28,000 kilometres an hour sideways; at that speed it falls round the Earth instead of back down. - [8](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/8/) — Most of a rocket is fuel, and its stages drop away as they empty. - [9](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/9/) — At launch the rocket speeds up so fast that astronauts are pressed back into their seats, which is why they lie on their backs. - [10](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/10/) — A hose pushes back when water rushes out of it, so firefighters must hold big hoses together. - [11](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/11/) — Squid, octopuses and jellyfish move by pushing out jets of water. - [12](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/12/) — The fastest humans run about 40 kilometres an hour at top speed; a horse runs faster, and a diving peregrine falcon is faster than a racing car. - [13](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/13/) — The Earth goes round the Sun at about 100,000 kilometres an hour, carrying you with it. - [14](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/14/) — The Earth also spins, and the ground near the equator spins round fastest, so a rocket launched there gets a free sideways start. - [15](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/15/) — In a braking car a helium balloon on a string leans backwards, because the heavier air sloshes forward and pushes the light balloon away, as water pushes a cork up. - [16](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/16/) — A curling stone slides far because smooth ice has very little friction, and the sweepers smooth and warm the ice to make it glide further. - [17](https://md.mova.elamur.ai/free/en/corpora/school/physics/38-rockets-record-speeds-and-motion-everywhere/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. - ← previous: [Seat belts, crashes and keeping safe](https://md.mova.elamur.ai/free/en/corpora/school/physics/37-seat-belts-crashes-and-keeping-safe/) - next →: [Day and night, and the Moon's faces](https://md.mova.elamur.ai/free/en/corpora/school/physics/39-day-and-night-and-the-moons-faces/) - ↑ back to [Physics](https://md.mova.elamur.ai/free/en/corpora/school/physics/)