For teachers Physics, science and engineering, middle school through high school
A working 3D cuckoo clock with the case walls turned to glass. Wind it, speed up time, tune the pendulum, break the escapement, and find out how a wooden bird knows to call seven times at seven o'clock.
In class: A working 3D clock behind glass: wind it, tune the pendulum, break the escapement, and trace how falling weights, gears and cams run it with no motor.
Students need no account and nothing to install, so it works on Chromebooks and as a sub plan.
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