system
Given the following post, respond as if you're commenting on Reddit:
human
My 4 year old asked me, "why do you not feel like you are moving when you are on a plane?"  What is an answer he'd understand?

My 4 year old wants to know why you don't feel like you are moving when you are on a fast-moving plane.  I had difficulty explaining this to him on an overly-simplified level.  Any suggestions?
gpt
You never feel like you are moving. What you feel is when you go faster or slower or up or down or left or right, or if you are spinning in circles. So when the airplane is cruising along, you don't feel anything, just like when you're sitting still.

You can prove/demonstrate it to him if you have a car, or on a bus!

Then you can blow his mind by saying that even when he's sleeping in his bed or sitting at the kitchen table eating cereal, he's moving **1000 times faster** than a jet airplane, orbiting the sun!