Luyện nói tiếng Anh bằng Shadowing qua video: Types of Levers

A lever is a simple machine that includes a bar that is free to move about a fixed point called a fulcrum.

Levers make work easier by reducing the effort required to move the load, but increasing the distance moved by the effort.

This can be achieved by moving the fulcrum closer to the load or applying the effort further from the fulcrum.

There are three types of levers.

First class levers, second class levers and third class levers.

Each type of lever makes work easier in different ways.

In a first class lever, the fulcrum is between the load and the place on the bar where the effort is applied.

This changes the direction of the effort.

Work is the easiest when the effort is applied to the bar as far from the fulcrum as possible.

The distance the effort moves is increased, but the force applied to the load is multiplied.

Moving the fulcrum closer to the load increases the distance the effort moves and increases the force applied to the load.

You use first class levers when you use pliers to pull a nail.

The piece of wood is the fulcrum.

The fulcrum is close to the load which increases the distance the effort moves and multiplies the force applied to the nail.

The back of a claw hammer, nail clippers and scissors are objects we use that function as first class levers.

In second class levers, the load is between the effort and the fulcrum.

The effort moves over a larger distance to raise the load a smaller distance, but with greater force.

The closer the load is to the fulcrum, the larger the distance the effort moves and the greater the force applied to the load.

Notice that in second-class levers, the effort applied is in the same direction as the force applied to the load.

Wheelbarrows, nutcrackers and bottle openers are objects we use that function as second-class levers.

In both first-class and second-class levers,

work is made easier by decreasing the effort required but applying the effort over a greater distance.

In a third class lever, the effort is between the fulcrum and the load.

Greater effort is required to move the load, but the speed at which the load moves is multiplied.

As in second class levers, the direction of the effort and the force applied to the load is in the same direction.

Fishing rods, baseball bats, and brooms are objects that function as third-class levers.

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Phương Pháp Shadowing Là Gì?

Shadowing là kỹ thuật học ngôn ngữ có cơ sở khoa học, ban đầu được phát triển cho chương trình đào tạo phiên dịch viên chuyên nghiệp và được phổ biến rộng rãi bởi nhà đa ngôn ngữ học Dr. Alexander Arguelles. Nguyên lý cốt lõi đơn giản nhưng cực kỳ hiệu quả: bạn nghe tiếng Anh của người bản xứ và lặp lại to ngay lập tức — như một "cái bóng" (shadow) đuổi theo người nói với độ trễ chỉ 1–2 giây. Khác với luyện ngữ pháp hay học từ vựng bị động, Shadowing buộc não bộ và cơ miệng phải đồng thời xử lý và tái tạo ngôn ngữ thực tế. Các nghiên cứu khoa học xác nhận phương pháp này cải thiện đáng kể phát âm, ngữ điệu, nhịp điệu, nối âm, kỹ năng nghe và độ lưu loát khi nói — đặc biệt hiệu quả cho người luyện IELTS Speaking và muốn giao tiếp tiếng Anh tự nhiên như người bản ngữ.

Phương pháp shadowing: đọc hướng dẫn từng bước đầy đủ →

Luyện nói tiếng Anh bằng Shadowing qua video: Types of Levers

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