Technology

 Train https://www.hitachi.co.jp/kids/kinopon/kinopontown/traffic/02/page1.html

https://m.mintetsu.or.jp/kids/know/qa/qa_mechanism.html

Electricity https://www.chuden.co.jp/

How a human moves

https://www.saga-ed.jp/kenkyu/kenkyu_chousa/h15/05annzennajikkenkansatu/kaminari040326/100kaihi/105doutai.htm

https://www.itmedia.co.jp/news/spv/2112/03/news046.html

Crane truck

https://oshihaku.jp/nenkan/page/14376959