This problem involves an amusement park ride, consisting of a vertical rotating cylinder. People ride on the inside of the cylinder. In the problem, we try to calculate the conditions under which people will not slide and fall down from the cylinder.

*Solution by Yaşar Safkan*

There is an important note here: At the end of the problem, we work out an estimation. For a rather low coefficient of friciton of 0.05, and a radius of 5m, we find that the needed frequency of rotation is about 1 Hz. This is all fine. However, there is an additional consideration omitted in the video. **In this case, the centripetal acceleration is about 200 meters per second squared, or in other words, 20g**. **As humans, this kind of acceleration is just too much, and definitely unrealistic for an amusement park ride. **