So, our Apologia Science text recommended making a Rube Goldberg Machine for a science experiment (I LOVE her text, but her experiment suggestions are CRAZY!) So, I googled it instead (the lazy - I mean efficient - Mom's way out ; )
I found these comedies built around Rube Goldberg Contraptions - and the same artist does brief explanations of the science behind it.
They're funny with a light dose of 6-simple-machines physics education on the side : )
https://www.youtube.com/channel/UCbNvfx ... pnRGxfu53Q(I haven't watched them ALL - so cannot be responsible for wholesomeness of all content - but they seem pretty good on that scale : )