My cousin put her soccer ball on the floor of our car. When we started moving, she was surprised when it hit her on the shin. She didn't understand why the ball moved, after all, there was no force being applied to it. I told her that it was simple physics!! It looks like the ball moved on its own, but that's according to the reference frame inside the car. If a person on the sidewalk could see through the car, they would think the ball is staying in place, and the car was moving!
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