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An accelerometer is a device that measures proper acceleration; proper acceleration is not the same as coordinate acceleration (rate of change of velocity).
What does the iPhone accelerometer do? Before we can say what the accelerometer of the iPhone does, we need to understand the basics of what an accelerometer does in general. The accelerometer is a device that can measure the force of acceleration, whether caused by gravity or by movement. An accelerometer can therefore measure the speed of movement of an object it is attached to. This is the job of the accelerometer in the Nike + iPod used in running shoes.