Atwood’s machine is presented in introductory physics courses as an exercise in the simultaneous solution of Newton’s second law for translational and rotational motions, assuming the pulley has nonnegligible mass. Occasionally it is also used as a lecture demonstration or for quantitative laboratory measurements of a system undergoing constant acceleration. As discussed in this paper, one can ...

Methods A single center, retrospective study was performed from January 2011 to December 2014. Total of 103 patients who were over 18 years of age and who visited emergency department (ED) with hanging injuries were enrolled. Individual characteristics, information related to hanging and cardiac arrest were collected. Laboratory test, imaging test, neurological sequelae or the Cerebral Performa...

The synchronization of two pendulum clocks hanging from a wall was first observed by Huygens during the XVII century. This type of synchronization is observed in other areas, and is fundamentally different from the problem of two clocks hanging from a moveable base. We present a model explaining the phase opposition synchronization of two pendulum clocks in those conditions. The predicted behav...