An accelerometer is a device that uses

Measures acceleration forces.

Explanation: An Accelerometer is a electromechanical device used to measure acceleration forces. Such forces may be static, like the continuous force of gravity. Dynamic to sense movement or vibrations.

Measures acceleration forces.

The motion sensors in accelerometers can even be used to detect earthquakes, and may by used in medical devices such as bionic limbs and other artificial body parts. Several devices, part of the quantified self movement, use accelerometers.

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the answers would be

the first one and the second one