Gravity, a constant in Earth’s environment, constrains not only physical motion but also our estimation of motion trajectories. Early studies show that natural gravitational acceleration facilitates ...

According to the general theory of relativity, accelerated motion is relative; that, however, is difficult to reconcile with experimental evidence; for example, in the case of rotation.

Accelerometers turn motion into measurable signals. From tilt and vibration to g-forces, they underpin countless designs. In this “Fun with Fundamentals” entry, we demystify their operation and take a ...