OK. This is still boring, so let's step on the accelerator.

好吧，这还是很无聊吧？,让我们打开加速器。

麻省理工公开课 - 计算机科学及编程导论课程节选

If it's going in a circle, you will say from now on, that it, indeed, has an acceleration, even though no one's stepping on the accelerator, of amount v^2 over R.

如果它在一个圆周上运动,你会说从现在起它其实有加速度,即使没有人去踩油门,加速度大小为 v^2 / R

耶鲁公开课 - 基础物理课程节选