fric·tion 
/ˈfrɪkʃən/ noun
/ˈfrɪkʃən/ noun [noncount] 1 a : the act of rubbing one thing against another
▪ Friction causes heat. ▪ the friction of sandpaper on wood
b : the force that causes a moving object to slow down when it is touching another object
▪ Oil in a car engine reduces/lessens friction. 2 : disagreement or tension between people or groups of people
▪ It was difficult to reach an agreement because of the friction between the two sides.
▪ Friction causes heat. ▪ the friction of sandpaper on wood
b : the force that causes a moving object to slow down when it is touching another object
▪ Oil in a car engine reduces/lessens friction.
▪ It was difficult to reach an agreement because of the friction between the two sides.
— fric·tion·al /ˈfrɪkʃənl̟/ adjective, technical
▪ frictional heating
/ˈfrɪkʃənl̟/ adjective, technical ▪ frictional heating
— fric·tion·less /ˈfrɪkʃənləs/ adjective
▪ a frictionless surface
/ˈfrɪkʃənləs/ adjective ▪ a frictionless surface
