Pratique du Shadowing: 5 Fun Physics Phenomena - Apprendre l'anglais à l'oral avec la vidéo
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Five fun physics phenomena.
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Number one: Have a friend hold a cane out horizontally for you or another similar object,
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and putting your two index fingers together try to place them underneath the center of mass.
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When they let go, you will find it doesn't normally work.
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But, Now try putting each index finger at opposite ends of the cane, and then moving your index fingers in towards the middle.
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what you will find is that they always end up right under the center of mass of the cane.
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You can try starting off asymmetrically.
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and they will still end up under the center of mass.
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You can try going at different speeds really slowly.
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you Or really fast?
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but you still end up perfectly under the center of mass.
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How does this work?
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Number two: The Phone Flip.
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Have you ever tried to spin your phone?
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If you do it in this direction, it's pretty easy.
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It stays nicely aligned.
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If you spin it along its short axis, you'll also find it spins very well.
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But, if you try to flip your phone end over end like this, you can't do it cleanly.
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The phone will never flip simply end over end without also rotating in one of the other directions.
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Even when I make an almost perfect flip, instabilities grow until the phone rotates around another axis.
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Why can't...
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No, I still can't do it.
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Why is it so?
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Number three.
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You've probably seen that if you rub a cup on your hair, you can make it electrically charged, and if you bring it close to a stream of water,
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you can actually cause that stream to deflect.
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Now usually this is used in chemistry textbooks as a demonstration of the polar nature of water.
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Water is a molecule with a more positive side and a more negative side.
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And so what happens, so you're told, is that the water molecule flips around
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so the positive side of the water faces the negative side of the cup
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and that is what attracts the water to the cup.
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But this is not the real explanation.
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If you have a uniform electric field, there's an equal force pulling the positive side towards it as there is pushing the negative side away from it.
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And so you can't actually do more than just turn the molecules.
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you would need a really, really strong gradient in your electric field to make this work at all
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and it basically is just not going to happen from a cup.
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So why is the stream actually attracted to a charged cup?
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That is the question.
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Number 4 Take a piece of your favorite cereal and drop it into a bowl of water.
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Then, using a very strong magnet, try to pull the cereal around.
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Bye.
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Isn't that cool?
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So why is cereal magnetic?
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And finally, five: the teabag rocket.
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Take a tea bag and cut off the sealed end very carefully.
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Now dump out the tea.
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Form the tea bag into a square column.
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and balance it on the plate.
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Now, light the top of the teabag on fire.
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Try to light it evenly on all sides.
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Get ready for takeoff in three, two, one.
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Ha, yeah!
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That is the beauty of the T -Bag Rocket.
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So why did that happen?
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So how do all of these phenomena work?
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Let me know in the comments, or make a video explaining any or all of them, or subscribe to the channel, and I'll post the answers next week.
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I hope you enjoyed those fun physics phenomena.
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I know a guy who would, the former commander of the International Space Station, Commander Chris Hatfield.
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I'm actually hosting live events with him in late August in Sydney and Canberra.
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I am so looking forward to that.
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Now the Sydney shows are all sold out, but there are still, as of now, tickets to the Canberra show.
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So if you want to come to that, check out the link in the description.
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Now Chris Hatfield actually wrote a book called "An Astronaut's Guide to Life on Earth."
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people who want to become astronauts but also for everyone who wants to lead a meaningful life here on Earth.
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And you can download this book for free
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if you like by going to audible .com /veritasium
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or you can pick any other book of your choosing for a one -month free trial.
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Audible is a great service with over a hundred and fifty thousand titles in all areas of literature including fiction, nonfiction, and periodicals and so you can find virtually anything you want there
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and by going to audible .com /veritasium they know that I sent you videos for you for free.
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So I really want to thank Audible for supporting me and I want to thank you for watching.
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À propos de cette leçon
Vous vous entraînez en anglais avec "5 Fun Physics Phenomena" en utilisant la technique du Shadowing.
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.