Fix magnets in pairs onto a metal sheet as shown. If you attach two magnetic discs onto an axle this “vehicle” will accelerate over the rows of magnets under certain conditions. Investigate the phenomenon.
3 Amazing Magnetic Accelerators | Magnetic Games (youtube, Magnetic Games, 30.10.2021),https://youtu.be/iyv9GhaITNE Wikipedia: Force between magnets, https://en.wikipedia.org/wiki/Force_between_magnets Wikipedia: Magnetic dipole, https://en.wikipedia.org/wiki/Magnetic_dipole Wikipedia: Magnetization, https://en.wikipedia.org/wiki/Magnetization Wikipedia: Neodymium magnet, https://en.wikipedia.org/wiki/Neodymium_magnet Wikipedia: Magnetic gear, https://en.wikipedia.org/wiki/Magnetic_gear