Does newton's cradle ever stop?

Question

im talking about in the real world.. is there a newton's cradle that will never stop?

if i was to go and buy one.. just to place on my desk, i want one that is as close to the real thing as possible; how accurate can they get in regards to not stopping?

Answer 1

Yes... by

1.Dissipation of heat due to friction at the ends of the strings and where the balls collide

2.Energy loss due to "clacking" sound produced

Answer 2

The ones that don't stop have a battery in them -- sometimes hidden very well.