If I were to fly a RC helicopter or quadcopter inside a car while we were driving, would it go to the back of the car, or fly with the cars movement?
>pic related, my quadcopter
It would move to the back. If, however, it were lighter than air and moves towards low pressure zones (like a balloon), it would actually move forward. When you car accelerates, the air in the car moves towards the rear because it resists changes in motion, like all matter.