The experiment “Acceleration (without g)” just gives the raw data from the phone’s (typically virtual) accelerometer.

Note, that there is a possibly confusing distinction between “Acceleration with g” and “Acceleration (without g)”. The sensor in your phone actually measures a force on a sample mass, which includes the contribution from gravitational acceleration. Therefore, this sensor will report the earth’s acceleration of 9.81 m/s² while the phone is resting (which is what we call “Acceleration with g”). In contrast, the physical acceleration is zero when the phone is resting (or moving at a constant speed), so most phones offer a virtual sensor which subtracts the constant acceleration (usually by taking into account the data from other sensors as well). This is what we call “Acceleration (without g)” and it will actually report an acceleration of zero while the phone is not accelerated.

2 thoughts on “Acceleration (without g)”

    1. If you have an up to date version of phyphox (1.0.6, released on 24 February 2017), the rate should already be the maximum supported by your device. For older versions there was a limit of 25Hz for the raw experiments, but custom experiments could be as fast as possible (that is, again, as fast as supported by the device).

      In general, you can create a simple custom experiment by pressing the “+” button on the main screen and set the desired rate for your sensor. Here “0” means as fast as possible and any other value means, that phyphox will average the data to get close to your desired rate (again, it can of course not exceed the hardware limits).

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