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This machine will stop ticking in 3 seconds, or 4 seconds. It's just not stable and forces go everywhere but kinetic in the balls. Im not complaining, it's cheap, and worthless :)
Verified purchase: Yes | Condition: New
good but smaller than I think.
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
Great to explain Newtons Law
Verified purchase: Yes | Condition: New