牛頓擺無限

Bought this for my desk and I’m genuinely surprised how smooth the endless swing feels—the magnetic pull keeps it going way past what a regular cradle would. My kid’s already using it to “study” momentum, so it’s doing double duty.

The magnetic mechanism keeps the end ball suspended longer than I expected, making it a great little desk toy for when I need a quick mental break during work. It’s sturdy enough for my kid to play with too, which is a nice bonus.

I love that the balls keep swinging for minutes on end without losing momentum, making it oddly hypnotic to watch. My kids fight over who gets to pull back the first ball, and it's been great for teaching them about energy transfer.