animation research-

The Bad,

Here's a stock frame animation of Newtons cradle , I think this is a rather jerky and poor portrayal of gravity . For the balls don't seem to have much energy , they seem to travel fast and yet go no distance.

The Good,

errrrrrrr... Funky style (not much going for it really), the fact its so bad you can see the string pulling one of the spheres up on the right.