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Rattleback, Pack of 10

Item # 753608
Rattleback, Pack of 10 is rated 5.0 out of 5 by 1.
  • y_2017, m_7, d_19, h_9
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Surprise your students with the unexpected spin-reversal motion of the rattleback. When spun correctly, the boat hull-shaped item rotates then suddenly reverses direction. Challenge your students to think about rotational motion. Comes in our choice of assorted colors. Pack of 10.

Price

$33.45

This item will ship on or about 8/9/17

Surprise your students with the unexpected spin-reversal motion of the rattleback. When spun correctly, the boat hull-shaped item rotates then suddenly reverses direction. Challenge your students to think about rotational motion. Comes in our choice of assorted colors. Pack of 10.

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How-To & Techniques

 
Rated 5 out of 5 by from stimulate classroom interest These are delightful. I'm glad to find a new source. I got my first one in 1974 from a science museum store. They are constructed on an ancient Celtic model, originally in smooth blue stone. They only want to turn counter-clockwise. If you spin them with a finger clockwise, they will slow down, rock, and start again counter-clockwise. You can ask "what did they call it before clocks?" "Sungates" was the way the sun goes across the sky, as seen from northern Europe. The opposite was "widdershins". These "rebellious Celts" only want to go widdershins, instead of the "Holy way of sungates" (or "deasil"). The rocking is the mechanism to transfer the kinetic energy from a clockwise angular momentum to the reverse. Just tapping the end of a non-moving "rattleback" will start it moving widdershins. The kinetic energy is not stored or destroyed; it is changed into a different direction but is still there. And, if you want to buy a bunch for adult friends, you can show them how they mimic adult life — even though you try to keep going the "right way" (clockwise), too often the world wants it to go the wrong way (counterclockwise). You just know that if you die by drowning, they'll have to look for the body upstream. Great fun for class and for social events. My only real question is, "Where did the ancient Celts digging mound graves ever find a surface smooth enough for these to work?" Was it only in the winter, on a frozen pond? Buy these in packs of 10 or 20, after you've used them in class. You'll love to give them to people to stimulate THEIR curiosity in the quirkiness of shapes, kinetic energy, and futility of trying to make things always go YOUR way in life.
Date published: 2013-06-06
  • y_2017, m_7, d_19, h_9
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0-hotfix-1
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_1
  • loc_en_US, sid_753608, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_carolina
  • bvseo_sdk, java_sdk, bvseo-4.0.0
  • CLOUD, getReviews, 20ms
  • REVIEWS, PRODUCT