Pratique du Shadowing: Friction and Gravity | MightyOwl Science | 3rd Grade - Apprendre l'anglais à l'oral avec la vidéo
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79 phrases
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Hello, this is Mighty Owl.
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Can you think about a time when you were riding your bike and you applied the brakes?
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The bike slowed down, right?
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Well, did you ever wonder why?
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Here's the answer.
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There are forces around us that cause changes to the motion of objects.
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Let me explain.
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A force that opposes motion is called friction.
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It has the power to slow things down.
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Friction is present wherever two surfaces rub over each other, such as using the brakes on a bike to stop or to slow down.
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When you use the brakes on your bike, the brake pads apply friction to the tires, and this friction slows down the motion of the bike.
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Think about riding your bike down a hill and how important friction is.
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Right?
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Friction is a force that pushes against an object to slow its motion.
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When you're riding your scooter, for example, you drag your foot on the ground to slow it down or even stop the scooter.
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You may have used friction in your life without even realizing it.
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But why does friction even exist?
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Well, friction occurs because no surface is 100% perfectly smooth.
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Rougher surfaces like grass create more friction.
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Have you ever tried to roller skate on grass?
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It's pretty difficult.
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You might even drip and fall.
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But how about roller skating on the sidewalk in front of your house?
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Well, that would be easier because the sidewalk is smoother than the grass, and therefore there's less friction.
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You can see examples of friction all around you.
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When you write with a pen, the frictional forces between the pen
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and the paper cause some of the ink particles to stick to the surface of the paper.
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Have you ever rubbed your hands together to keep warm?
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The friction between your skin causes some of the energy of motion to be converted into heat.
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Before matches were invented, people used to rub two sticks together to start a fire.
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Just be careful if you decide to try that one out yourself.
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Now the next time you walk around, think about your feet pushing off the ground.
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You're applying frictional force.
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But you might want to be careful if you're walking on an icy sidewalk sidewalk, it can get tricky because it's quite smooth and there isn't much friction for your feet to use as a grip.
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If you slip and fall, well, that's another force entirely.
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In fact, the force that pulls things down to the center of the earth is called gravity.
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That's why when you jump up from the ground, you fall back no matter how hard you try to stay up in the air.
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Wait a What about astronauts jumping on the moon and slowly falling down?
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Well, gravity also exists on the moon, but it's not as strong as it is on the Earth.
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That's why astronauts can jump higher and fall back down more slowly, because the Moon is much smaller than our planet, and its gravity is less.
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Gravity is also what holds the Earth
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and all the rest of the planets in our solar system in their orbits around the Sun.
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Thank goodness for that!
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or else our Earth would spin away from the sun and float out into outer space.
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So to sum up everything so far, gravity is a pulling force that keeps us on the ground.
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Without it, we would all be floating around in the air.
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Now that might sound great, but can you imagine if there was no gravity on Earth?
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You wouldn't be able to run, lay in your bed, or even play basketball.
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Without gravity, if you kicked a ball, It would fly away in space and it would never come back.
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Now you can't see or touch gravity, but it's always there.
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In fact, no matter how heavy or light an object is, gravity will still pull it back down to the ground.
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You can climb up a ladder and drop a watermelon, a feather, or a ball.
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It doesn't matter.
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They will all still fall back down to the ground.
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Imagine for a second you have a cannon and you shoot a cannonball straight up into the sky.
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No matter how high it goes, gravity will pull it back down to the ground.
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But what if you threw a ball away from you?
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Yep, gravity will also pull it back to the ground.
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The force of gravity brings things down no matter what direction you throw them.
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Wow, you know so much about forces now.
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But maybe something you didn't know?
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All of them in fact work together.
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Take a look at what I mean.
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Imagine you push a ball down a ramp.
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The push gets the ball rolling.
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Gravity pulls the ball down the ramp.
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Friction pushes back and slows the ball's motion.
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At the bottom of the ramp, the ball bumps into a wall.
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The wall pushes back on the ball and stops it from rolling forward.
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Well there you go!
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All the forces we talked about do really work together in real life.
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Two new forces from today, friction and gravity.
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The force that opposes motion is called friction, and it has the power to slow things down.
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The factors that affect friction are the roughness of the surfaces and the force between the two objects.
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When you drop something on the ground, it falls because of gravity.
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Gravity is a pulling force that pulls things down to the ground.
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I think that's enough about forces for today.
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See you in the next video lesson.
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Thank you.
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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale de niveau A2 s’appuie sur la vidéo « Friction and Gravity ». Les mots qui reviennent le plus souvent : friction, gravity, force, ground, ball. Cette vidéo contient 79 phrases et 938 mots à répéter en shadowing. La partie parlée dure 5:31. Le locuteur parle à un rythme naturel d’environ 170 mots par minute, proche d’une conversation courante. 83 % des mots font partie des 3 000 mots les plus courants en anglais ; le reste mérite d’être vu avant de commencer. 12 de ses 79 phrases sont des questions : un bon entraînement pour l’intonation interrogative et les réponses courtes.
Vocabulaire clé de cette vidéo
15 mots de la vidéo à retenir, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| friction nom | /ˈfɹɪkʃən/ | frottement, friction |
| gravity nom | /ˈɡɹævɪti/ | gravité |
| sidewalk nom | /ˈsaɪdwɔk/ | trottoir |
| smooth adjectif | /smuːð/ | doux, facile |
| grass nom | /ɡɹɑːs/ | herbe |
| brake nom | /bɹeɪk/ | frein |
| float verbe | /fləʊt/ | flotter |
| oppose verbe | /əˈpoʊz/ | s'opposer à |
| skate nom | /skeɪt/ | patin |
| astronaut nom | /ˈæstɹəˌnɔt/ | astronaute |
| scooter nom | /ˈskuːtə(ɹ)/ | trottinette |
| lesson nom | /ˈlɛs.ən/ | leçon |
| occur verbe | /əˈkɜː/ | se produire, avoir lieu |
| dragon nom | /ˈdɹæɡən/ | dragon |
| spin verbe | /spɪn/ | tournoyer, pivoter rapidement |
Les verbes à particule que vous entendrez
| Mot | Prononciation | Sens |
|---|---|---|
| fall back verbe | se replier, se rabattre | |
| slow down verbe | ralentir, décélérer | |
| come back verbe | revenir | |
| fall down verbe | /fɔl ˈdaʊn/ | tomber |
| walk around verbe | déambuler |
Des phrases à répéter
Des phrases courtes et complètes de la vidéo, à réutiliser dans la conversation de tous les jours :
- Have you ever tried to roller skate on grass?
- Have you ever rubbed your hands together to keep warm?
- But maybe something you didn't know?
- I think that's enough about forces for today.
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait | is called · be converted · were invented |
| Present perfect have/has + participe passé — une action passée qui compte encore maintenant | Have you ever tried · Have you ever rubbed |
| Possibilité avec « might / may » might/may + verbe — quelque chose de possible mais pas certain | may have · might even drip · might want |
| Comparatifs -er than / more … than — comparer deux éléments | smoother than · smaller than |
Prononciation à surveiller
Le locuteur utilise 8 contractions et formes réduites, comme you're, can't, didn't. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Les sons « th »: smooth /smuːð/, feather /ˈfɛðə/
Les sons difficiles pour les francophones :
- /r/ anglais — langue recourbée, sans frotter la gorge: friction /ˈfɹɪkʃən/, gravity /ˈɡɹævɪti/, grass /ɡɹɑːs/, brake /bɹeɪk/, roller /ˈɹoʊlɚ/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Commencez à la vitesse 0,75×, répétez phrase par phrase, puis revenez à la vitesse normale quand cela devient facile.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme friction, gravity, sidewalk.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.