跟讀練習: GCSE Physics - Energy Stores, Transferring Energy & Work Done - 通過影片學習英語口語
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50 句
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The most essential thing to learn from this video is that energy is never created or destroyed.
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It's only ever transferred between different forms and objects.
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This principle underlies loads of the physics course, but today we're just going to look at the different forms that energy can take,
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how energy moves between them, and what we mean by the term work done.
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Whenever energy is transferred to an object, the energy is stored in one of that object's energy stores.
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We take a look at each of them in other videos, but to give you a basic idea, there's thermal or internal energy,
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which is basically the heat energy trapped within an object and is related to the temperature of that object.
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Kinetic energy, which is associated with the movement
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or motion of an object gravitational potential energy which is the energy
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that an object possesses
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because of its position in a gravitational field elastic potential energy
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such as the energy held in an already stretched spring chemical energy
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which is held in chemical bonds magnetic energy
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which is what holds magnets to your fridge electrostatic energy
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which is what occasionally gives you a shock when you touch your car
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and finally nuclear energy
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which is what we get from breaking atoms apart now the key idea is
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that the energy in each of these stores isn't fixed instead
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it can be transferred from one to another
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this could be done mechanically such as physically stretching an elastic
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band electrically such as plugging something into a socket – by heating,
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or by radiation, like light or sound waves.
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When we consider a particular object, or group of objects, we can call the collection of matter a system,
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which is just the fancy term that you need to use in physics.
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When the system changes, energy is transferred, either between objects, or between different forms.
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In an open system, the matter of the system can exchange energy with the so -called outside world,
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which is just all of the matter that's outside of our system.
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This means that an open system can lose or gain energy as it interacts with the outside world.
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by comparison a closed system is separate from the outside world
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so neither matter nor energy can enter or leave and
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so even though energy can be transferred within the system the overall change is always zero
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to understand how this actually works in practice let's take a look at a couple of examples
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imagine we have a kettle and we fill it with water
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when we turn it on electrical energy from the plug socket
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flows to the heating element of the kettle where it's transferred
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electrically to the thermal energy store of the kettle's heating element
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which basically means
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that the flow of electricity warms the metal heating element the heating element
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then in turn transfers the energy over to the water's thermal energy store, and after a short while we have a boiled kettle.
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Another way of saying energy transferred is work done, and there are two main types you need to know, mechanical and electrical.
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Mechanical work done involves using a force to move an object, such as kicking a ball up in the air,
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which involves energy from the chemical energy store of your leg being transferred to the kinetic energy store of the ball.
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Electrical work, on the other hand, is done when current flows.
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You can think of this as the energy required to overcome the resistance in the wires of a circuit.
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To put this into practice, imagine a train that's about to cross a broken bridge.
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In order to stop, it applies the brakes, which creates friction between the brakes and the wheels.
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We say that the friction does work as it slows the train down,
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because it causes energy in the wheels' kinetic energy stores to be transferred to the thermal energy stores of the surroundings things,
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in the form of heat, which will hopefully slow down the train.
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Anyway, that's all for today, so if you enjoyed it, then let us know down below in the comments, and we'll see you next time!
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本課的詞彙與口語要點
這節口語課以影片“GCSE Physics - Energy Stores, Transferring Energy & Work Done”為素材。 影片中反覆出現的詞有：energy, object, transferred, store, heating。 這段影片共有 50 個句子、696 個單詞可供跟讀。 講話部分時長為 5:01。 說話人語速平穩，每分鐘約 139 個詞，很適合跟讀。 84% 的單詞屬於英語最常用的 3,000 詞，其餘的詞建議在練習前先學一下。
影片中的重點詞彙
影片中 15 個值得學習的單詞，附發音和釋義：
| 單詞 | 發音 | 釋義 |
|---|---|---|
| element 名詞 | /ˈɛləmənt/ | 要素 |
| kettle 名詞 | /ˈkɛ.təl/ | 水壺 /水壺, 壺 /壺 |
| physics 名詞 | /ˈfɪz.ɪks/ | 物理學 /物理學 |
| stretch 動詞 | /stɹɛt͡ʃ/ | 伸展, 拉 |
| plug 名詞 | /plʌɡ/ | 插頭 /插頭 |
| brake 名詞 | /bɹeɪk/ | 剎車 /剎車, 制動器 /制動器 |
| friction 名詞 | /ˈfɹɪkʃən/ | 摩擦 |
| elastic 形容詞 | /ə-/ | 彈性的 /彈性的, 有彈力的 /有彈力的 |
| socket 名詞 | /ˈsɑkɪt/ | 插座, 插口 |
| shock 名詞 | /ʃɔk/ | 衝擊 /衝擊 |
| wire 名詞 | /ˈwaɪɚ/ | 線 /線, 鐵絲 /鐵絲 |
| associate 名詞 | /əˈsoʊʃi.ət/ | 同行, 同事 |
| occasionally 副詞 | /əˈkeɪʒənəli/ | 偶爾 /偶爾, 偶然 |
| principle 名詞 | /ˈpɹɪn.sɪ.pəl/ | 原理, 原則 /原則 |
| trap 名詞 | /tɹæp/ | 陷阱, 圈套 |
影片中出現的短語動詞
| 單詞 | 釋義 |
|---|---|
| slow down 動詞 | 減速 /減速, 放慢 |
影片中的語法
說話人最常用的結構，並附上影片中的原話：
| 結構 | 影片中的用法 |
|---|---|
| 被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的 | is never created · is transferred · is associated |
| 定語從句 who / which + 從句 — 補充說明人或事物 | energy, which is · energy which is · heat, which will |
需要注意的發音
說話人用了 3 次縮略和弱讀形式，例如 isn't, we'll, we're。請按聽到的簡短形式來說。
- “sh” 和 “zh” 音: friction /ˈfɹɪkʃən/, shock /ʃɔk/, associate /əˈsoʊʃi.ət/, occasionally /əˈkeɪʒənəli/, radiation /ˌɹeɪ.diˈeɪ.ʃən/
- 長單詞——注意重音位置: electrical /ɪˈlɛktɹɪkəl/, mechanical /məˈkænəkəl/, electricity /ɪˌlɛkˈtɹɪsɪti/, associate /əˈsoʊʃi.ət/, occasionally /əˈkeɪʒənəli/
中文母語者容易讀錯的音：
- /v/ — 不要讀成 /w/，上齒輕觸下唇: involve /ɪnˈvɑlv/, overcome /ˌəʊ.vəˈkʌm/, gravitational /ˌɡɹævɪˈteɪʃənəl/
- 詞尾子音 — 要讀清楚，後面不要加母音: element /ˈɛləmənt/, physics /ˈfɪz.ɪks/, stretch /stɹɛt͡ʃ/, involve /ɪnˈvɑlv/, plug /plʌɡ/
- /r/ 和 /l/ 的區別: electrical /ɪˈlɛktɹɪkəl/, electricity /ɪˌlɛkˈtɹɪsɪti/, principle /ˈpɹɪn.sɪ.pəl/, electrically /ɪˈlɛk.tɹɪk.li/, gravitational /ˌɡɹævɪˈteɪʃənəl/
如何用這段影片練習
- 先完整聽一遍影片，不要開口，記下不認識的單詞。
- 用正常速度逐句跟讀，每句重複到你的節奏與說話人一致為止。
- 錄下自己的聲音並與原聲對比，特別注意 element, kettle, physics 這類單詞。
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。