This is a good point. Newtonian mechanics is fairly simple to understand because it operates at scales and velocities we are familiar with. Hell, I'd say you can grok a lot of it by throwing stuff in the air and thinking carefully about what happens.
On the other hand, I'm reminded of the following lecture by Brian Cox. He explains the double-slit experiment, draws things on a board, shows a really nice physical demonstration with water, and.... the person on stage is still completely lost: http://youtu.be/PaGwpbHJWGE?t=1m54s
I'm not sure how much better that could possibly be explained.
On the other hand, I'm reminded of the following lecture by Brian Cox. He explains the double-slit experiment, draws things on a board, shows a really nice physical demonstration with water, and.... the person on stage is still completely lost: http://youtu.be/PaGwpbHJWGE?t=1m54s
I'm not sure how much better that could possibly be explained.