シャドーイング練習: Types of Levers - 動画で英語スピーキングを学ぶ
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A lever is a simple machine that includes a bar that is free to move about a fixed point called a fulcrum.
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Levers make work easier by reducing the effort required to move the load, but increasing the distance moved by the effort.
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This can be achieved by moving the fulcrum closer to the load or applying the effort further from the fulcrum.
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There are three types of levers.
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First class levers, second class levers and third class levers.
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Each type of lever makes work easier in different ways.
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In a first class lever, the fulcrum is between the load and the place on the bar where the effort is applied.
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This changes the direction of the effort.
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Work is the easiest when the effort is applied to the bar as far from the fulcrum as possible.
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The distance the effort moves is increased, but the force applied to the load is multiplied.
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Moving the fulcrum closer to the load increases the distance the effort moves and increases the force applied to the load.
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You use first class levers when you use pliers to pull a nail.
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The piece of wood is the fulcrum.
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The fulcrum is close to the load which increases the distance the effort moves and multiplies the force applied to the nail.
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The back of a claw hammer, nail clippers and scissors are objects we use that function as first class levers.
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In second class levers, the load is between the effort and the fulcrum.
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The effort moves over a larger distance to raise the load a smaller distance, but with greater force.
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The closer the load is to the fulcrum, the larger the distance the effort moves and the greater the force applied to the load.
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Notice that in second-class levers, the effort applied is in the same direction as the force applied to the load.
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Wheelbarrows, nutcrackers and bottle openers are objects we use that function as second-class levers.
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In both first-class and second-class levers,
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work is made easier by decreasing the effort required but applying the effort over a greater distance.
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In a third class lever, the effort is between the fulcrum and the load.
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Greater effort is required to move the load, but the speed at which the load moves is multiplied.
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As in second class levers, the direction of the effort and the force applied to the load is in the same direction.
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Fishing rods, baseball bats, and brooms are objects that function as third-class levers.
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このレッスンについて
「Types of Levers」を使って、シャドーイングで英語を練習しましょう。
毎日15〜30分の練習で、IELTSスピーキングへの自信と実践的な英会話力が身につきます。
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。