Did you know that, at a certain point on a moving wheel... there's no motion? Did you know that, at a certain point on a moving wheel... there's no motion? I mean, kinda... it's all relative, right?

We solve for centripetal acceleration, centripetal force, and tangential velocity. In this Closer Look segment on circular motion, we investigate circular motion and solve for centripetal acceleration ...

Keywords: Ground motion. Torsion. Rotational excitations. Seismic designs. Surface distribution method (SDM). Seismic arrays. Eccentricity. Single station procedure (SSP). Multiple station procedures ...