Here’s why your wheelie suitcase wobbles | Science News

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Here’s why your wheelie suitcase wobbles

Roller luggage simulation provides physics insights possibly relevant to other vehicles

7:05pm, June 20, 2017
rolling luggage

ROCKIN’ ROLLER Physicists give the play-by-play of what makes rolling luggage rock back and forth.

Anyone who’s dragged roller luggage knows it’s liable to fishtail. To most people, this is a nuisance. To a few scientists, it’s a physics problem. Researchers detail the precise interplay of forces that set suitcases shimmying in a study published online June 21 in Proceedings of the Royal Society A.

The researchers simulated and observed the motion of a toy model suitcase on a treadmill. They found that the suitcase’s side-to-side motion at any given moment is related to its tilt and distance off-center from the line of travel.

For instance, imagine a suitcase rolling straight ahead, but then hitting a bump or cutting a corner that causes the right wheel to lift. The suitcase’s tilt makes the left wheel steer the suitcase rightward. When the right wheel falls back to the ground and the left wheel lifts off, the suitcase — now positioned

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