Prática de Shadowing: Power – Rate of Work - Aprenda a falar inglês com vídeo

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1
Ever walked up a flight of stairs and wondered why running up feels so much harder?
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Think about what it takes to get up stairs.
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With every step, your muscles lift your body against gravity.
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If you ran up instead, you'd still have to lift your weight through the same height.
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That's where power comes in.
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Power tells us how quickly work is done.
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To find average power, divide the work by the time it takes.
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Work is measured in years, time in seconds, and power in watts.
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So, if you see a power rating of one watt, that means one gear of energy is transferred every second.
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Let's put some numbers to that.
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Imagine a climb that takes 1 ,200 years of work against gravity.
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If you take 12 seconds, your average power is 100 watts.
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What if you do that same climb in 6 seconds?
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Now you're doing 200 years of work each second.
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Half the time, twice the power.
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Imagine taking a ride in a sports car.
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The driver presses the accelerator and you feel yourself pressed back into the seat as the car picks up seats.
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The car is gaining kinetic energy.
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How quickly can its engine supply energy?
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Take a 400 kilowatt engine.
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At full power, it can deliver 400 ,000 joules of mechanical energy every second.
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Now picture a standard halfback on an everyday drive.
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It can reach motorway speed, too.
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Suppose this engine is rated at 60 kW.
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At full power, that's 60 ,000 wheels every second.
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If the two cars have similar mass, they need roughly the same gain in kinetic energy to go from rest to motorway speed.
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With similar grip and losses, the more powerful car can get there seen.
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Now let's look at the world's fastest landowner, the Cheetah.
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Imagine how quickly it has to gather speed when it chases its head.
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In just a quick drive, its muscles give its body a big increase in kinetic energy.
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That's a burst of high power.
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Compare that with a hard -working husky.
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Picture it pulling a light sled along a snowy trail.
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Once the sled is gliding at a steady speed, is the husky still doing work?
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It is.
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The snow resists the sled's motion, so the husky has to keep pulling.
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Its talent is disdaining that effort over a long distance.
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Next time you head upstairs, Think about two questions.
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How much work does it take to lift you to the top?
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And how quickly do you do it?
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The first tells you about the energy changes.
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Put that together with the time taken and you have your average path.
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Thank you.

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Vocabulário e dicas de fala para esta lição

Esta aula de conversação usa o vídeo “Power – Rate of Work”. As palavras que mais se repetem: energy, speed, quickly, husky, kinetic. Este vídeo tem 43 frases e 431 palavras para praticar shadowing. A fala dura 3:26. O falante mantém um ritmo estável de cerca de 126 palavras por minuto, confortável para o shadowing. 83% 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
watt substantivo/wɑt/watt
muscle substantivo/ˈmʌs.əl/músculo
climb verbo/ˈklaɪ̯m/subir
gravity substantivo/ˈɡɹævɪti/gravidade
rat substantivo/ɹæt/ratazana, rato
stairs substantivo/ˈstɛɹz/escada
everyday adjetivo/ˈɛvɹiˌdeɪ/cotidiano
gear substantivo/ɡɪɚ/equipamento
compare verbo/kəmˈpɛɚ/comparar
trail substantivo/tɹeɪl/rasto, rastro
chase verbo/t͡ʃeɪs/caçar, perseguir
roughly advérbio/ˈɹʌf.li/rudemente, precariamente
mechanical adjetivo/məˈkænəkəl/mecânico
steady adjetivo/ˈstɪdi/estável
gather verbo/ˈɡæðɚ/colher

Phrasal verbs que você vai ouvir

PalavraSignificado
get up verbosubir
pick up verbopegar

Pronúncia para ficar de olho

  • Palavras longas — acerte a sílaba tônica: mechanical /məˈkænəkəl/, accelerator /əkˈsɛl.əˌɹeɪ.tɚ/

Sons difíceis para falantes de português:

  • Consoante final — sem acrescentar um “i” depois: watt /wɑt/, rat /ɹæt/, resist /ɹɪˈzɪst/, burst /bɜːst/, divide /dɪˈvaɪd/
  • /l/ final — a língua toca o céu da boca, não vira “u”: muscle /ˈmʌs.əl/, trail /tɹeɪl/, mechanical /məˈkænəkəl/, joule /d͡ʒuːl/
  • /h/ — um sopro suave, diferente do “r”: husky /ˈhʌs.ki/, halfback /ˈhæfˌbæk/

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 watt, muscle, climb.

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 →