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Rattleback M-m4g
The rattleback, or celt, will slow down and reverse direction when rotated against its preferred rotational direction. Fishbane Chapter:   100 Reese Chapter:   10.918 RHK 5th:   10.4 PIRA DCS classification:   1M40.90

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Physics Lecture Demonstrations at the Department of Physics and Astronomy
The Johns Hopkins University