Newton's cradle. Five steel balls hang from the frame, each on two strings. The first is pulled back; when it swings down and strikes the row, the push passes straight through and the ball at the far end flies out to the same height, then back, again and again, while the three in the middle barely move. Everything here is worked out in 3D, step by step: drag to look around it.
SquesmosSpatial Squinetics
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