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The Friction Oscillator

The friction oscillator mechanism consists of a rod moving horizontally over two disks separated by a distance ; the disks spin in opposite directions, providing a net kinetic friction with effective coefficient . Kinetic friction (shown in green) is proportional to the weight . The rod moves a distance because the components of normal forces (in brown) are changing.


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The normal forces are
, ,
and the frictional forces are
, .
[1] D. Russell. The Friction Oscillator [Video]. (Jul 23, 2013) www.youtube.com/watch?v=46lk2FXzwT8.
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