Which device is in the picture?

For every action, there is opposite and equal reaction.

I had one of these "toys" when I was a kid. If you lift two metal balls on one side and let them strike the others then two balls will lift on the opposite side too. The same thing will happen if three balls are used also. Neat toy to watch.

wow, didn't know this had a name...I just always called it the ball thingie

Player-T G 3503313, that's true but a Newton's cradle is more about the transference of energy.

Executive ball clicker! 😂

Player #ussdefiant, gotta love Spencer's

Kiwozzie, "Newton's balls" is pretty funny too.

Player-T G 3503313, that is the law of karma.

I had always called these ball hitter thingy mabobbers