On the ride "Barrel of Fun" at an amusement park, people can bepinned against the vertical wall of a rotating barrel cylinderwithout falling to the floor. Which of the following statements are true?
1) The ride is possible because there is a force that pushes therider against the wall
2) As long as the barrel is rotating, the rider will not fall
3) The smoother the surface of the wall, the slower it must rotateto keep the rider pinned
4) The centripetal force is provided by friction
5) The force that balances the weight is the kinetic friction