[OC] Apparently the iPhone has a very sensitive accelerometer, so I used it to measure my car's performance. It revealed some interesting things, like how depressing the clutch causes a larger (negative) acceleration than the engine ever does, and the effects of engine braking.
from /r/dataisbeautiful
[OC]显然，iPhone有一个非常敏感的加速度计，所以我用它来测量我的车的性能。它揭示了一些有趣的事情，比如踩下离合器会导致比发动机更大的（负）加速度，以及发动机制动的影响。