center of mass

简明释义

质量中心

英英释义

例句

1.In a two-body system, the center of mass moves in a straight line if no external forces act on it.

在一个双体系统中，如果没有外力作用，质心将沿直线移动。

2.The center of mass of a uniform rod is located at its midpoint.

均匀杆的质心位于其中点。

3.In physics, the center of mass refers to the point where the mass of a body is concentrated.

在物理学中，质心指的是一个物体的质量集中点。

4.When designing vehicles, engineers must ensure that the center of mass is low to improve stability.

在设计车辆时，工程师必须确保质心较低，以提高稳定性。

5.To calculate the center of mass of a system, you need to consider the mass and position of each object.

要计算一个系统的质心，需要考虑每个物体的质量和位置。

作文

The concept of the center of mass is fundamental in physics and engineering, as it provides a crucial understanding of how objects behave under various forces. The center of mass (质心) is defined as the point in an object or system where the entire mass can be considered to be concentrated for the purpose of analyzing translational motion. This point is not always located within the physical boundaries of the object, especially in irregularly shaped bodies or systems composed of multiple parts.To illustrate the importance of the center of mass, let’s consider a simple example: a seesaw. When two children of different weights sit at different distances from the pivot point, the seesaw will balance when their moments about the pivot are equal. This balance occurs because the center of mass of the system (the seesaw plus the children) is aligned with the pivot. If one child is heavier and sits closer to the pivot, the seesaw will tilt towards that side, demonstrating how the center of mass influences stability and balance.In sports, understanding the center of mass can significantly enhance performance. Athletes often train to control their body’s center of mass during activities such as gymnastics, diving, or even running. For instance, a gymnast must keep their center of mass over their base of support to maintain balance while performing complex routines. Similarly, in running, an athlete’s ability to efficiently manage their center of mass can lead to improved speed and reduced energy expenditure.In engineering, the center of mass plays a vital role in the design and stability of structures and vehicles. Engineers must calculate the center of mass of buildings to ensure they can withstand forces such as wind or earthquakes. For vehicles, the center of mass affects handling; a low center of mass improves stability, while a high center of mass can lead to tipping during sharp turns.Moreover, the center of mass is not static; it can change with the distribution of mass within an object. For example, when a diver tucks their body into a ball, their center of mass shifts, allowing them to rotate more quickly in the air. This principle is also utilized in robotics, where understanding the center of mass is essential for creating stable and efficient movements in robotic arms or autonomous vehicles.In conclusion, the center of mass is a pivotal concept that transcends various fields of science and everyday life. Whether in sports, engineering, or basic physics, recognizing and manipulating the center of mass can lead to better performance, enhanced stability, and a deeper understanding of motion. By grasping this concept, individuals can apply it in practical situations, leading to improvements in both their personal and professional endeavors.

质心的概念在物理学和工程学中是基础性的，因为它为我们提供了关于物体在各种力作用下如何行为的关键理解。质心被定义为一个物体或系统中可以被认为是集中整个质量的点，用于分析平移运动。这个点并不总是位于物体的物理边界内，特别是在不规则形状的物体或由多个部分组成的系统中。为了说明质心的重要性，让我们考虑一个简单的例子：跷跷板。当两个不同体重的孩子坐在不同距离支点的位置时，跷跷板将在他们相对于支点的力矩相等时保持平衡。这种平衡发生是因为系统（跷跷板加上孩子们）的质心与支点对齐。如果一个孩子更重且坐得离支点更近，跷跷板就会向那一侧倾斜，这展示了质心如何影响稳定性和平衡。在体育运动中，理解质心可以显著提高表现。运动员通常训练以控制他们身体的质心，在体操、跳水甚至跑步等活动中。例如，体操运动员必须保持他们的质心在支撑基底上，以维持在执行复杂动作时的平衡。类似地，在跑步中，运动员有效管理其质心的能力可以提高速度并减少能量消耗。在工程学中，质心在建筑和车辆的设计与稳定性中起着至关重要的作用。工程师必须计算建筑的质心，以确保它们能够抵御风或地震等力的影响。对于车辆来说，质心会影响操控性；低的质心提高了稳定性，而高的质心则可能导致在急转弯时翻车。此外，质心不是静态的；它可以随着物体内部质量的分布而变化。例如，当潜水员将身体收成一个球形时，他们的质心发生了变化，从而允许他们在空中更快地旋转。这个原理也被应用于机器人技术，理解质心对于创造稳定和高效的机器人手臂或自动驾驶车辆的运动至关重要。总之，质心是一个超越科学和日常生活各个领域的关键概念。无论是在体育、工程还是基础物理中，识别和操控质心都可以带来更好的表现、增强的稳定性以及对运动的更深入理解。通过掌握这一概念，个人可以在实际情况中应用它，从而在个人和职业追求中取得进步。