Science
Rebar in concrete: https://www.youtube.com/watch?v=cZINeaDjisY
Anti-gravity flywheel: https://www.youtube.com/watch?v=GeyDf4ooPdo
Changing centre of gravity on a trailer from front to back (very short) https://www.youtube.com/watch?reload=9&v=Z5vxX8EAqJc
Centre of gravity on logging trucks: https://www.youtube.com/watch?v=yWWbAr9iLZg
Centre of gravity for forklift: https://www.youtube.com/watch?v=95kb-PcPYsM
Centre of gravity loading a heavy weight onto a boat: https://www.youtube.com/watch?v=A3ApI4uIFuY
Centre of Mass: https://www.youtube.com/watch?v=ajTyhbvMEAg