Prática de Shadowing: Can You Define Energy? - Aprenda a falar inglês com vídeo

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Here's a question that sounds easy.
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What is energy?
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Go on, try it.
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Define it to a friend.
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You've said the word a thousand times.
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You've got energy after breakfast.
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A battery runs out of energy.
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The sun gives off energy.
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But if I asked you to point at energy, actually point at it, where would you point?
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You can't.
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And that's the strange part.
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Energy might be the most important idea in all of science, and nobody has ever seen it.
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Not once.
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Not with a microscope.
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Not with a telescope.
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Because energy isn't a thing.
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It's not stuff like water or air.
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You can't fill a jar with it.
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You can't put it on a scale and weigh it.
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Open a textbook and you'll find energy defined as the ability to do work or to make change.
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It doesn't tell you what energy is, it tells you what energy does.
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And that's the catch.
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We can't see energy, but we can see the changes it causes when it's converted from one form into another.
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Think about a campfire.
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There's a lot of air.
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Chemical potential energy is stored inside the wood, but a log just looks like a log.
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Then it burns, and that chemical energy converts into heat and light.
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You feel the warmth on your face.
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You see the glow.
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You're not seeing energy.
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You're seeing a conversion.
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A diver standing on a diving board may not appear to have energy energy, but their height gives them gravitational potential energy.
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The board stores elastic potential energy as it bends, then launches them upwards.
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As they fall, gravitational potential energy becomes kinetic energy.
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Energy transfers to the water, creating waves and sound.
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Every step of the way, you only notice the energy at the moment it changes form.
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Or look at a solar panel on a roof.
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Sunlight hits it, but nothing seems to happen.
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No noise, no moving parts.
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It just sits there.
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But inside the panel's photovoltaic cells, light energy is being converted into electrical energy.
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Now step inside the home and switch on a fan.
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Suddenly, the blades are spinning.
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That's electrical energy converting into kinetic energy.
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Light energy into electrical energy and then inside the house into many other forms.
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Kinetic energy in a fan, heat in a toaster, light and sound from a TV.
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So here's the sneaky bit.
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Scientists don't define energy by what it is, they define it by what it does.
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Textbooks say energy is the ability to make things happen, to move something, heat something, or light something up.
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That's true.
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But notice it describes the effects, not the thing itself.
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So that's why energy is so hard to define.
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We've never seen it, not once.
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We've only ever seen its footprints.
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Vocabulário e dicas de fala para esta lição

Este vídeo tem 54 frases e 464 palavras para praticar shadowing. A fala dura 3:20. O falante mantém um ritmo estável de cerca de 139 palavras por minuto, confortável para o shadowing. 84% das palavras estão entre as 3.000 mais comuns do inglês; vale a pena estudar o restante antes de começar.

Vocabulário principal deste vídeo

15 palavras do vídeo que vale a pena aprender, com pronúncia e significado:

PalavraPronúnciaSignificado
define verbo/dɪˈfaɪn/definir
convert verbo/kənˈvɝt/converter, transformar
textbook substantivo/ˈtɛkst.bʊk/livro de texto, compêndio
spin verbo/spɪn/girar, rodar
conversion substantivo/kənˈvɝʒən/conversão
scientist substantivo/ˈsaɪəntəst/cientista
blade substantivo/bleɪd/lâmina, fio
bend verbo/bɛnd/dobrar, curvar
dive verbo/daɪv/mergulhar
weigh verbo/weɪ/pesar
glow verbo/ɡloʊ/brilhar
sunlight substantivo/ˈsʌnˌlaɪt/luz do sol
warmth substantivo/wɔɹmθ/calor
telescope substantivo/ˈtɛl.əˌskoʊp/telescópio
upwards advérbio/ˈʌpwɚdz/para cima

Phrasal verbs que você vai ouvir

PalavraPronúnciaSignificado
give off verbo/ɡɪv ɒf/soltar, exalar

Gramática neste vídeo

As estruturas que o falante mais usa, com as palavras exatas do vídeo:

EstruturaNo vídeo
Present perfect have/has + particípio passado — uma ação passada que ainda importa agoraYou've said · has ever seen · We've never seen
Voz passiva be + particípio passado — o foco está no que acontece, não em quem fazis stored · being converted

Pronúncia para ficar de olho

O falante usa 14 contrações e formas reduzidas, como can't, we've, you're. Diga-as na forma curta, do jeito que você ouve.

  • Os sons de “sh” e “zh”: conversion /kənˈvɝʒən/, gravitational /ˌɡɹævɪˈteɪʃənəl/
  • Palavras longas — acerte a sílaba tônica: electrical /ɪˈlɛktɹɪkəl/, gravitational /ˌɡɹævɪˈteɪʃənəl/

Como praticar com este vídeo

  1. Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
  2. Faça shadowing frase por frase na velocidade normal, repetindo cada uma até o seu ritmo ficar igual ao do falante.
  3. Grave a sua voz e compare com o original, prestando atenção a palavras como define, convert, textbook.

O que é a Técnica de Shadowing?

Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.

Técnica de shadowing: leia o guia completo passo a passo →