--- title: Bangs and loud sounds: firecrackers and ears — a lesson of Mova's school · trees and pragmatics description: «Bangs and loud sounds: firecrackers and ears», a lesson of the physics course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: A bang is one sudden, hard shove on the air: instead of a gentle wobble, the air is pushed out all at once in a single sharp --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/) [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/) / Bangs and loud sounds: firecrackers an… # Bangs and loud sounds: firecrackers and ears Lesson 19 of the physics course of Mova's primary school: 18 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/19-bangs-and-loud-sounds-firecrackers-and-ears/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/0/) — A bang is one sudden, hard shove on the air: instead of a gentle wobble, the air is pushed out all at once in a single sharp wave. - [1](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/1/) — Inside a firecracker a small amount of powder burns in a flash and turns into a lot of hot gas all at once; the gas bursts outwards and slams the air, and that slam reaches your ears as a crack. - [2](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/2/) — Close up, that slam is strong enough to hurt: it hits your eardrum with a sudden hard push, and in someone's hand the hot gas can break bones and burn skin, which is why only trained adults handle fireworks. - [3](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/3/) — A popping balloon makes a small bang in the same way, when its squashed air escapes all at once. - [4](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/4/) — Ears are delicate: the tiny hair cells inside never grow back, so a ringing in your ears after a bang is a warning that they have been hurt. - [5](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/5/) — A firecracker bangs because the powder inside burns in a flash, making a lot of hot gas that shoves the air outwards in one sharp pressure wave. - [6](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/6/) — A firecracker close to your ears can tear the eardrum or kill the tiny hair cells inside the ear, and those cells never grow back. - [7](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/7/) — Ringing in the ears after a loud bang is a warning sign that the ears have been damaged. - [8](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/8/) — A firecracker going off in a hand can break bones and burn flesh, and every year hospitals treat children who lost fingers to fireworks. - [9](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/9/) — A firework that did not go off can still explode later, so you never go back to a lit firework; you leave it and tell an adult. - [10](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/10/) — Dogs and cats hide on fireworks night because their hearing is far more sensitive than ours and they do not understand the sudden bangs. - [11](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/11/) — People help pets on fireworks night by keeping them indoors with the curtains closed and some quiet music on. - [12](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/12/) — A balloon bursts at a pin's touch because the tiny hole lets the stretched rubber rip apart in an instant, and the squashed air rushes out all at once. - [13](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/13/) — A piece of sticky tape on a balloon can let a pin go in without a bang, because the tape stops the rubber ripping. - [14](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/14/) — A slammed door bangs because it hits the frame and pushes the air away suddenly; a soft rubber strip on the frame makes it quieter. - [15](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/15/) — Noise-cancelling headphones listen to the noise and play the opposite wave, so the push and the pull cancel out; they work best on steady droning noise (a low, steady hum, like a train or a plane engine). - [16](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/16/) — Sound spreads out in every direction and gets weaker with distance, so a faraway shout is faint. - [17](https://md.mova.elamur.ai/free/en/corpora/school/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/17/) — Sound effects copy real sounds with other things, such as coconut shells for horses' hooves, because our brains recognise the pattern of the wobbles. - ← previous: [Thunder, sirens and how fast sound travels](https://md.mova.elamur.ai/free/en/corpora/school/physics/18-thunder-sirens-and-how-fast-sound-travels/) - next →: [Light and shadows](https://md.mova.elamur.ai/free/en/corpora/school/physics/20-light-and-shadows/) - ↑ back to [Physics](https://md.mova.elamur.ai/free/en/corpora/school/physics/)