Little bear and Newton

Little bear was playing in his bedroom (supposed to be going to sleep...) and became distraught.

'Car go backwards, car go backwards.'

Poor little bear, the toy garage is on a very slight incline, and the surface doesn't have much friction. So when a light thing with wheels is placed in the right way, it rolls and as little bear was placing it exactly right, the car did indeed roll backwards and little bear was not happy with Gravity. Nor was he particularly impressed by the standard of explanations provided. It wasn't right and it wasn't fair and I think he eventually sulked off to bed.