angular momentum

简明释义

角动量

英英释义

例句

1.When ice skaters pull their arms in, they decrease their moment of inertia and increase their angular momentum 角动量.

当花样滑冰者收起手臂时，他们减少了转动惯量，并增加了他们的角动量 angular momentum。

2.In a vacuum, a planet's angular momentum 角动量 allows it to orbit the sun indefinitely.

在真空中，行星的角动量 angular momentum使其能够无限期地围绕太阳运行。

3.The spinning top maintains its angular momentum 角动量 as long as no external forces act on it.

陀螺在没有外力作用下保持其角动量 angular momentum。

4.In physics, the conservation of angular momentum 角动量 is a fundamental principle in closed systems.

在物理学中，角动量 angular momentum的守恒是封闭系统中的一个基本原理。

5.The angular momentum 角动量 of a rotating wheel is crucial for understanding its stability.

旋转轮子的角动量 angular momentum对于理解其稳定性至关重要。

作文

Angular momentum is a fundamental concept in physics that describes the rotational motion of an object. It is defined as the product of an object's moment of inertia and its angular velocity. In simpler terms, it measures how much motion an object has when it spins around an axis. Understanding angular momentum (角动量) is crucial in various fields, including mechanics, astronomy, and engineering.To grasp the concept of angular momentum (角动量), we must first understand the two key components that make it up: moment of inertia and angular velocity. The moment of inertia is a measure of how mass is distributed in an object relative to the axis of rotation. For instance, a solid disk has a different moment of inertia than a hollow cylinder, even if they have the same mass. This difference affects how easily the object can be rotated. Angular velocity, on the other hand, refers to how fast an object is rotating and is usually measured in radians per second.The formula for angular momentum (角动量) can be expressed as L = Iω, where L represents angular momentum, I is the moment of inertia, and ω is the angular velocity. This equation shows that if either the moment of inertia or the angular velocity increases, the angular momentum (角动量) will also increase. This relationship is essential in understanding the conservation of angular momentum, which states that in a closed system with no external torques acting on it, the total angular momentum remains constant.One of the most fascinating applications of angular momentum (角动量) is in the field of astronomy. For example, planets orbiting the sun exhibit a specific angular momentum due to their mass and velocity. As these planets move closer to the sun, they speed up, conserving their angular momentum. This principle explains why comets travel faster as they approach the sun and slower as they move away.In sports, angular momentum (角动量) plays a vital role in the performance of athletes. Gymnasts, for instance, utilize their body’s angular momentum (角动量) during routines. When they tuck their bodies in while performing a flip, they decrease their moment of inertia, which causes them to spin faster. Conversely, when they extend their limbs, they increase their moment of inertia, slowing down their rotation. This manipulation of angular momentum (角动量) is key to executing complex maneuvers successfully.In engineering, understanding angular momentum (角动量) is crucial for designing stable structures and vehicles. For instance, when engineers design roller coasters, they must consider the angular momentum (角动量) of the cars as they navigate loops and turns. Failure to account for this can lead to dangerous situations, such as derailments or unexpected flips.In conclusion, angular momentum (角动量) is more than just a theoretical concept; it is a practical tool that helps us understand and predict the behavior of rotating objects in our universe. Whether in the vastness of space, the precision of sports, or the complexities of engineering, the principles governing angular momentum (角动量) are integral to our comprehension of the physical world. By studying this concept, we can gain deeper insights into the mechanics of motion and the forces that govern our reality.

角动量是物理学中的一个基本概念，用于描述物体的旋转运动。它被定义为物体的惯性矩与其角速度的乘积。简单来说，它衡量的是物体围绕某一轴旋转时所具有的运动量。理解角动量(angular momentum)在力学、天文学和工程等多个领域至关重要。要掌握角动量(angular momentum)的概念，我们首先必须了解构成它的两个关键组成部分：惯性矩和角速度。惯性矩是指相对于旋转轴，物体质量分布的度量。例如，一个实心圆盘的惯性矩与一个空心圆柱的惯性矩不同，即使它们的质量相同。这种差异会影响物体旋转的难易程度。另一方面，角速度指的是物体旋转的快慢，通常以每秒弧度来测量。角动量(angular momentum)的公式可以表示为L = Iω，其中L代表角动量，I是惯性矩，ω是角速度。这个方程表明，如果惯性矩或角速度增加，角动量(angular momentum)也会增加。这种关系对于理解角动量守恒至关重要，角动量守恒定律指出，在一个没有外部扭矩作用的封闭系统中，总角动量保持不变。角动量(angular momentum)的一个引人入胜的应用是在天文学领域。例如，围绕太阳运行的行星由于其质量和速度表现出特定的角动量。当这些行星靠近太阳时，它们会加速，从而保持其角动量。这一原理解释了为什么彗星在接近太阳时速度更快，而远离太阳时速度较慢。在体育运动中，角动量(angular momentum)对运动员的表现起着重要作用。例如，体操运动员在表演时利用他们身体的角动量(angular momentum)。当他们在翻转时收缩身体时，他们减少了自己的惯性矩，这导致他们旋转得更快。相反，当他们伸展四肢时，他们增加了惯性矩，从而减缓旋转速度。这种对角动量(angular momentum)的操控是成功执行复杂动作的关键。在工程学中，理解角动量(angular momentum)对设计稳定的结构和车辆至关重要。例如，当工程师设计过山车时，他们必须考虑到汽车在穿越环形和转弯时的角动量(angular momentum)。如果未能考虑这一点，可能会导致危险情况，例如脱轨或意外翻转。总之，角动量(angular momentum)不仅仅是一个理论概念；它是一个实用工具，帮助我们理解和预测宇宙中旋转物体的行为。无论是在浩瀚的太空、精确的体育竞技，还是复杂的工程设计中，支配角动量(angular momentum)的原则都是我们理解物理世界的核心。通过研究这一概念，我们可以深入洞察运动的力学及支配我们现实的力量。