What is the name of the object with 5 metal balls connected to strings that swing?

The object has five metal balls in a line that are hanging by a wire and when the one on the edge swings and hits the others the last one on the other side swings as well. People usually have them on tables for decoration I guess.What is the name of the object with 5 metal balls connected to strings that swing?
Pendulum





Here is a picture of it:


http://images.google.com/imgres?imgurl=h鈥?/a>What is the name of the object with 5 metal balls connected to strings that swing?
http://images.google.com/images?hl=en%26amp;safe=off%26amp;resnum=0%26amp;q=newton's+cradle%26amp;um=1%26amp;ie=UTF-8%26amp;sa=N%26amp;tab=wi





Newton's Cradle
It is a Newtons Cradle and was quite popular a few years back. Did you ever notice you can't fool it? If you drop three balls, three come up the other side, not two. If you drop two, two come up. You can't get three by slaming two down a little harder! Pretty interesting, huh?
It is called the newtons cradle
Newtons Cradle