Funny mecanism!
you can make it with the free SketchUp 2017 Make and the free "Physics"
MS Physics by Anton... https://sketchucation.com/pluginstore?pln=MSPhysics

Free SKetchUp 2017 Make can be downloaded here (you must have a Google account (for example Gmail) )
https://www.sketchup.com/download/all

If you don't know MS Physics take a look here
a complete tutorial ;) 26 short videos
https://www.youtube.com/watch?v=TmQ5Cei-OjI&list=PLUIFQTbizmaH1HkiRzde6Nwmrs9bAv6lD

Here the first! ;)



If you want a very cool free 2D "Physic" prog take a look to the free Algodoo!
http://www.algodoo.com