Category: Friction
Coefficient of friction
https://serc.carleton.edu/dmvideos/players/block_slides_ra.html?hide_banner=true
Rub surfaces together, see atoms/temp rise
https://phet.colorado.edu/sims/html/friction/latest/friction_en.html
Helen rates this resource as good
Pull block to show F vs t graph for static/kinetic friction
http://www.thephysicsaviary.com/Physics/Programs/Labs/ForceFriction/index.html
Helen rates this resource as Good