▪️Create a cushion of air like a hovercraft
▪️Ball bearings
▪️Rollers
▪️Lubricating oils
▪️Chalk on the hands of the gymnast helps prevent their hands from slipping on the apparatus.
▪️Cars are streamlined to reduce friction.
▪️Tight clothing, and wearing a cap can reduce water resistance while swimming.
▪️skaters have thin blades on their boots to reduce friction so they can glide across the ice easily.