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The Not-so-simple Pendulum 2

Things are roughened up and friction is now added to the approximate simple pendulum

Falling Beads

Stage: 5 Challenge Level: Challenge Level:2 Challenge Level:2

It might help to express the distance traveled by a particular bead in the Cartesian coordinates in order to describe what's going on.

 

Extension: Think about the symmetry and the possible shape of beads.