This probably sounds stupid, but why is it easy to get up in a plane, and walk around as if you were on the ground. Then on a bus it’s harder even though the speed of the vehicle, is slower?
In: Physics
It’s not the speed itself, but the changes in speed which matter most when you’re trying to stay upright.
A big and heavy plane doesn’t change it’s speed fast enough to cause trouble (except during for example take-off and turbulence), while a bus is constantly maneuvering around traffic on a bumpy road.
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