MEMS accelerometers are microelectromechanical systems that measure the static or dynamic force of acceleration. Static force refers to the earth’s gravitational pull. On the surface of the Earth, all objects fall with an acceleration defined as one "g", which is approximately equal to 9.81 m/s² (32.17 ft/s²). Quite often, "g" is used as a unit of acceleration rather than expressing acceleration in m/s² or ft/s². Dynamic forces result when movement or vibration is applied to the accelerometer itself. Accelerometers enable such functionality as screen orientation, hard-disk-drive protection, gesture recognition for interactive games, activity monitoring for power management, and much more.
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