Why is it easier to balance on a plane than a bus, even though it is going at a faster speed?

Question

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

Answer 1

Inertia+Bernoulli effect=balance. Basically if a bus had Indy car type spoilers, it would have the same balance