“point mass(in mechanics)”的概念、定义、翻译、参考文献-科学参考

单词	point mass(in mechanics)
释义	point mass(in mechanics) Mathematics The simplifying assumption that all the mass of a body is concentrated at a single point. This can be a reasonable assumption, even when applied to a planet or star, as the gravitational potential outside a spherically symmetric massive body is indistinguishable from a point mass with the same total mass placed at the centre of the body.
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