12-06-2023, 03:04 PM

I was trying to measure the acceleration and deceleration of a tramway between two stops (on a straight flat route without any curves) using the "acceleration without g" experiment. From the acc data I calculated the velocity of the tram. Unfortunately, at the end of the measurement the calculated velocity is far from the expected value of zero. (The velocity v increases to about 9m/s, then drops back to around 6.5m/s)

Similarly, trying to reproduce this result in a small scale experiment, I manually accelerated and decelerated my phone along one axis (y) from standstill to some velocity back to standstill. Again, my velocity calculations dont end at a value of zero. (Velocity starts at 0, increases to about 2.5m/s, then decreases to -0.6m/s)

So, the areas under the acc-vs-time plot don't add up to zero.

Any ideas what I might be doing wrong? Thanks!

Similarly, trying to reproduce this result in a small scale experiment, I manually accelerated and decelerated my phone along one axis (y) from standstill to some velocity back to standstill. Again, my velocity calculations dont end at a value of zero. (Velocity starts at 0, increases to about 2.5m/s, then decreases to -0.6m/s)

So, the areas under the acc-vs-time plot don't add up to zero.

Any ideas what I might be doing wrong? Thanks!