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Change in acceleration is one. I always wondered if we could feel that.

It’s called jerk and it’s what gives you a whiplash feeling.

Fun fact: the derivatives of position after velocity, acceleration, and jerk are snap (or jounce), crackle, and pop.

It's also what makes you fall over on the bus or train.

You can handle a surprising amount of lateral acceleration if the jerk is low. 0.5g is pretty much like standing on a steep hill.