https://phet.colorado.edu/sims/html/energy-forms-and-changes/latest/energy-forms-and-changes_all.html
https://phet.colorado.edu/sims/html/energy-forms-and-changes/latest/energy-forms-and-changes_all.html
https://www.youtube.com/watch?si=XwGgus5P0ImDWKqG&v=BOqvBrQKUcQ&feature=youtu.be