Classic Newton Cradle Balance Balls, Science Psychology Puzzle Desktop Entertainment Gadgets with Black Wooden Base, 5.5" x 4.5"x 5.5", Medium Size

This is very junky. The strings are very thin fishing wire and they tangle very easily. One of them broke the first day. Can basically only pull one ball back at a time. If you pull more, all the wires tangle.

The cradle is made of very cheap material, but you get what you paid for. My son enjoyed playing with it but the balls kept getting tangled and then fell off when we attempted to untangle them. I would probably get a more expensive one next time so it lasts longer.

This item was a gift for my child. He loves physics and has always wanted one. Very poor craftsmanship and the balls tangled so badly I couldn't get them undone. It's going in the trash

Does not look like the pictures. Description states “black wooden base” but it’s 100% plastic. Feels cheap all around.

In theory it works however it doesn't stay together and isn't very durable.

came broken and tangled. dont waste your time or money. my son was disappointed with his Christmas gift and do was I

I bought the Newton Cradle to demonstrate the conservation of momentum to my physics students. In addition, as I discussed the operation of the apparatus with my classes, we reviewed velocity, forces and energy too. Now, the alignment of the mechanism is not perfect. Yet, for a physics teacher that has no budget, the price is the right. More importantly, the device conveyed to my students a conceptual understanding of the conservation of momentum and much more.

Cheesy plastic and small. Not worth it.