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Damped oscillations at the top

Forces during the rotation

The data were collected using Verniers Wireless Dynamic Sensor  System (WDSS), at 25Hz, in one of the outer seats.
(Data file)

Modern phones have 3-axis accelerometer + In addition most also have a 3 axis gyroscope, that would provide interesting data, using e.g. one of the apps: 

So far, most SmartPhones are limited to 2g per axis, but this is essentially sufficient for Mechanica.

See also our published papers about the physics in amusement rides at Liseberg (and elsewhere).