DetailsFor illustrating an effect of inertia. When you place the ball on the card and pull back the spring -the card (cloth) shoots forward but the ball (dish) drops back to post (table). Actually the ball did move but because it is a ball -it settled into the cup. (The ball has a 5 mm flat spot which permits to stay on the card.) Try the same experiment with a coin. Contains: glass ball -card -plastic base -post -hardware -instructions.
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Catalogue Number EAIN0000 Size No Pack PC