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Walking the Spool M-k1c
The spool can roll forward or backwards when the string is pulled, depending on the angle of pull. HRW 6th:   13.4 Reese Chapter:   10.919 RHK 5th:   9.5 PIRA DCS classification:   1K10.300

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