• So, if we think about the force that occurs between a positively and a negatively charged particle, what we have is essentially a Coulomb force, so we can describe this as a force of attraction.

    一个带负电的粒子之间,的作用力,这本质上就是库伦力,我们可以把它,描述成一个引力。

    麻省理工公开课 - 化学原理课程节选

  • By the way, I didn't tell you this but I think you know that I picked my origin to be here and measured y positively to be upwards and I called that 15 meters.

    顺便说一下,虽然我没明确指出,但我想你们应该都知道,我把原点取在这里,并规定y的正方向朝上,我设把这里的高度为15米

    耶鲁公开课 - 基础物理课程节选

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