Momentum (動量)

Momentum (動量)

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什麼是動量？ | What is Momentum?

在物理學中，動量是一個描述物體運動狀態的物理量。

In physics, momentum is a physical quantity that describes the state of motion of an object.

它通常被非正式地描述為「運動中的質量」。

It is often informally described as "mass in motion."

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基本公式 | The Basic Formula

一個物體的動量取決於兩個因素：它的質量和它的速度。

The momentum of an object depends on two factors: its mass and its velocity.

動量的數學表達式如下：

The mathematical expression for momentum is as follows:

P = mV

• P 代表動量。

  p represents momentum.

• m 代表質量（物體有多少物質）。

  m represents mass (how much matter is in the object).

• V 代表速度（物體移動快慢及其方向）。

  V represents velocity (how fast the object is moving and its direction).

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核心概念 | Core Concepts

1. 質量與速度的影響： 一個物體的質量越大或是移動速度越快，它的動量就越大。

   Influence of Mass and Velocity: The more mass an object has or the faster it moves, the greater its momentum.

2. 它是向量： 動量不僅有大小，還有方向。

   It is a Vector: Momentum has both magnitude and direction.

3. 停止它的難度： 動量越大，要讓該物體停下來就越困難。

   Difficulty in Stopping: The more momentum an object has, the harder it is to stop that object.

範例： 一輛緩慢行駛的卡車可能與一顆飛速前進的子彈具有相同的動量，因為卡車擁有巨大的質量，而子彈擁有極高的速度。

Example: A slowly moving truck can have the same momentum as a fast-moving bullet because the truck has huge mass, while the bullet has extremely high velocity.

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動量守恆 | Conservation of Momentum

在一個封閉系統中，總動量保持不變，除非有外力作用。

In a closed system, the total momentum remains constant unless acted upon by an external force.

這意味著在碰撞過程中，一個物體失去的動量會被另一個物體獲得。

This means that during a collision, the momentum lost by one object is gained by another.

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您想透過一些計算練習來測試一下這個公式，還是想深入了解動量在現實生活（如汽車碰撞）中的應用？

Would you like to test this formula with some practice calculations, or would you prefer to dive deeper into real-life applications of momentum, such as in car crashes?

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Placeholder 湯偉晉編寫的英文字典

Placeholder 湯偉晉編寫的英文字典

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