V2EX center of mass

Center of Mass

释义 Definition

质心(或:质量中心):在一个物体或系统中,可把全部质量视为集中在该点上;在外力作用下,系统整体的平动运动可用该点的运动来描述。日常语境中常与“重心”混用,但在重力场不均匀时两者不一定相同。

发音 Pronunciation

/sen.t v ms/

例句 Examples

The center of mass is near the middle of the rod.
这根杆的质心在靠近中间的位置。

To predict how the skater will spin, we track the center of mass of the skaterracket system as forces and torques act during the jump.
为了预测滑冰者会如何旋转,我们在跳跃过程中跟踪“滑冰者球拍”系统的质心,并考虑其受力与力矩的影响。

词源 Etymology

center 来自拉丁语 centrum(中心),与希腊语 kentron(圆心、尖点)相关;mass 来自拉丁语 massa(团块、块状物)。组合成 center of mass,字面义即“质量的中心”,用于物理学中描述质量分布的等效集中点。

相关词 Related Words

文学与著作中的用例 Literary Works

  • Isaac Newton, Philosophi Naturalis Principia Mathematica(《自然哲学的数学原理》;相关概念以“质心/中心”与运动定律框架呈现)
  • Richard P. Feynman, The Feynman Lectures on Physics(《费曼物理学讲义》;在力学与系统运动章节中频繁讨论)
  • David Halliday, Robert Resnick & Jearl Walker, Fundamentals of Physics(《物理学基础》;入门教材中常以“center of mass”讲解刚体与多粒子系统运动)
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