If you sit in a fast moving car on a highway, you will see the objects outside the window moving backwards with respect to you. Assume that your motion is uniform. One would think that all static objects would move backwards with uniform speed.
However, in real, if you sit in the backseat of a van, you will find the background move at a very fast speed from your window. However, if you look through the window of the people sitting in front, the landscape doesn't move as fast. If you carefully follow one part of the landscape (say a stationary patch of grass, or a moving car), you will see it accelerating as it reaches your window.
Why is this so?
P.S. I don't know much physics, so please explain simply.