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OrangeTag 2508 Newton's Cradle Art in Motion, 7 1/4-Inch
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| List Price: | $22.98 |
| Price: | $7.95 & FREE Shipping on orders over $49. Details |
| You Save: | $15.03 (65%) |
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- Classic desk toy
- Performing based on Newton's Laws
- Frame and balls are made of metal
$7.95
& FREE Shipping on orders over $49. Details
In Stock.
Sold by ALPINE SMART and Fulfilled by Amazon.
Fulfillment by Amazon (FBA) is a service we offer sellers that lets them store their products in Amazon's fulfillment centers, and we directly pack, ship, and provide customer service for these products. Something we hope you'll especially enjoy: FBA items qualify for FREE Shipping and .
If you're a seller, Fulfillment by Amazon can help you increase your sales. We invite you to learn more about Fulfillment by Amazon .
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Customer Reviews
Top Customer Reviews
By
Scott Roberts
on July 16, 2011
Verified Purchase
As another customer experienced, I received it with one of the the fish lines broken. I fixed it with 5 min epoxy and dental floss, which was kind of tricky. The 4th ball was a little out of alignment and I managed to stretch the fish line without breaking it to get it closer in line.
The vertical distance from the supports to the balls is 5.5 inches. The balls are good quality (not chrome plated, probably nickel plated) and weight 45 grams, 2.2 cm diameter. It has 30 to 40 swings back and forth, 0.39 seconds between strikes, before becoming small and nonexistent at about 80. Reviewers complain that the balls move too much, even after the first strike, but this is normal if the balls are touching before the first strike. The 4th ball moves noticeably forward and the first 3 move back ever so slightly in accordance with a detailed physics explanation (see wikipedia). The silver support bar is cheap plastic.
As another reviewer said, I seem to remember cleaner and more distinct action as a child, but heavier balls would not improve it. A video on youtube shows what appears to be the exact same balls with a different support working much better, so the alignment must be crucial. An improvement would be if the balls were slightly separated, but this would require reworking the wire connections and being very careful about the alignment. With a separation, the first strike is a sequence of independent collisions which prevents the intermediate balls from moving. Contrary to intuition, touching balls decreases the effect, making the 4th ball move more and the 5th ball move less, at least on the 1st strike. You can confirm this by sliding quarters on a table under the two conditions of almost-touching and not touching.Read more ›
The vertical distance from the supports to the balls is 5.5 inches. The balls are good quality (not chrome plated, probably nickel plated) and weight 45 grams, 2.2 cm diameter. It has 30 to 40 swings back and forth, 0.39 seconds between strikes, before becoming small and nonexistent at about 80. Reviewers complain that the balls move too much, even after the first strike, but this is normal if the balls are touching before the first strike. The 4th ball moves noticeably forward and the first 3 move back ever so slightly in accordance with a detailed physics explanation (see wikipedia). The silver support bar is cheap plastic.
As another reviewer said, I seem to remember cleaner and more distinct action as a child, but heavier balls would not improve it. A video on youtube shows what appears to be the exact same balls with a different support working much better, so the alignment must be crucial. An improvement would be if the balls were slightly separated, but this would require reworking the wire connections and being very careful about the alignment. With a separation, the first strike is a sequence of independent collisions which prevents the intermediate balls from moving. Contrary to intuition, touching balls decreases the effect, making the 4th ball move more and the 5th ball move less, at least on the 1st strike. You can confirm this by sliding quarters on a table under the two conditions of almost-touching and not touching.Read more ›
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By
K. W.
on November 8, 2014
Verified Purchase
This was purchased for a friend's son. I just opened it to place in gift bag. The base was scratched, looks terrible. The wires are totally tangled and I cannot straighten them. To buy a new gift today. Disappointed to say the least.
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