TY  - BOOK
AU  - DeWeerd, Alan J.  
AU  - Hill, Eric 
TI  - Conservation of Angular Momentum with Slightly Modified Commercial Apparatuses (Journal Article) 
SN  - 0031-921X
PY  - 2023///
CY  - Washington 
PB  - :American Association of Physics Teachers 
KW  - Newtonian mechanics| Rotational dynamics| 3D printing| Laboratories
N1  - ***______{For Hard Copy, Please visit Library.}________***


N2  - Abstract: A spinning ice-skater who speeds up when she pulls in her arms is a common textbook illustration of how changing a rotating object’s moment of inertia affects its angular speed. An analogous classroom demonstration involves sitting on a rotating stool while moving handheld weights in and out. Given that students have difficulties understanding conservation of angular momentum when the moment of inertia changes,1 we wanted to add a quantitative experiment that closely resembled the typical textbook example and the in-class demonstration. A few such experiments have been published: an apparatus that moves masses radially relative to a person rotating on a stool,2 a rotating track along which model cars move radially inward or outward,3 and a modified, centripetal-force apparatus with masses that slide outward.4 The first two were more elaborate than we wanted, but the third one seemed to be a suitable experiment for an introductory lab. However, as described, that experiment required substantial modifications to a relatively expensive apparatus.5 We have found two ways to perform the experiment by making simple modifications to less expensive commercial apparatuses from two manufacturers
UR  - https://doi.org/10.1119/5.0108491
ER  -