Why the suitcases with two wheels rattle and move uneven more when we pull itWe all use suit cases with two wheels when we go for tours as they are easy to handle and we need not carry it but we can pull it. It is general observation that suit cases with two wheels rattle and move unevenly towards sides. This is experienced by many. But cases with 4 wheels won't do that. Scientists from France found that if we pull it more fast it may not move this side and that side.Even when pull it fast also some times it will fall down. If we keep the handle nearer to ground chances of falling are very less. But chances are more when it goes through uneven places and up downs.
This is the explanation given by these scientists. Do you agree?